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2291998 = 21145999
BaseRepresentation
bin1000101111100100011110
311022110000211
420233210132
51041320443
6121043034
725324132
oct10574436
94273024
102291998
111326015
1292647a
13623317
144393c2
1530419d
hex22f91e

2291998 has 4 divisors (see below), whose sum is σ = 3438000. Its totient is φ = 1145998.

The previous prime is 2291987. The next prime is 2291999. The reversal of 2291998 is 8991922.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2291998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572998 + ... + 573001.

It is an arithmetic number, because the mean of its divisors is an integer number (859500).

22291998 is an apocalyptic number.

2291998 is a deficient number, since it is larger than the sum of its proper divisors (1146002).

2291998 is a wasteful number, since it uses less digits than its factorization.

2291998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146001.

The product of its digits is 23328, while the sum is 40.

The square root of 2291998 is about 1513.9346088917. The cubic root of 2291998 is about 131.8473518553.

The spelling of 2291998 in words is "two million, two hundred ninety-one thousand, nine hundred ninety-eight".

Divisors: 1 2 1145999 2291998