99990972 has 18 divisors (see below), whose sum is σ = 252755048. Its totient is φ = 33330312.

The previous prime is 99990971. The next prime is 99990973. The reversal of 99990972 is 27909999.

It is an interprime number because it is at equal distance from previous prime (99990971) and next prime (99990973).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1388728 + ... + 1388799.

Almost surely, 2^99990972 is an apocalyptic number.

It is an amenable number.

99990972 is an abundant number, since it is smaller than the sum of its proper divisors (152764076).

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

99990972 is a wasteful number, since it uses less digits than its factorization.

99990972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777537 (or 2777532 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 54.

The square root of 99990972 is about 9999.5485898114. The cubic root of 99990972 is about 464.1449148529.

The spelling of 99990972 in words is "ninety-nine million, nine hundred ninety thousand, nine hundred seventy-two".