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99921372 = 2238326781
BaseRepresentation
bin1011111010010…
…10110111011100
320222000112100120
411331022313130
5201034440442
613525354540
72322213645
oct575126734
9228015316
1099921372
1151448451
1229568a50
1317916a95
14d3b06cc
158b8b4ec
hex5f4addc

99921372 has 12 divisors (see below), whose sum is σ = 233149896. Its totient is φ = 33307120.

The previous prime is 99921347. The next prime is 99921373. The reversal of 99921372 is 27312999.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99921373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4163379 + ... + 4163402.

It is an arithmetic number, because the mean of its divisors is an integer number (19429158).

Almost surely, 299921372 is an apocalyptic number.

It is an amenable number.

99921372 is an abundant number, since it is smaller than the sum of its proper divisors (133228524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99921372 is a wasteful number, since it uses less digits than its factorization.

99921372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8326788 (or 8326786 counting only the distinct ones).

The product of its digits is 61236, while the sum is 42.

The square root of 99921372 is about 9996.0678269007. The cubic root of 99921372 is about 464.0371985140.

The spelling of 99921372 in words is "ninety-nine million, nine hundred twenty-one thousand, three hundred seventy-two".

Divisors: 1 2 3 4 6 12 8326781 16653562 24980343 33307124 49960686 99921372