99972135 has 24 divisors (see below), whose sum is σ = 179262720. Its totient is φ = 51479232.

The previous prime is 99972079. The next prime is 99972157. The reversal of 99972135 is 53127999.

It is a happy number.

It is not a de Polignac number, because 99972135 - 2²¹ = 97874983 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36999 + ... + 39608.

It is an arithmetic number, because the mean of its divisors is an integer number (7469280).

Almost surely, 2^99972135 is an apocalyptic number.

99972135 is a deficient number, since it is larger than the sum of its proper divisors (79290585).

99972135 is a wasteful number, since it uses less digits than its factorization.

99972135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76647 (or 76644 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 99972135 is about 9998.6066529292. The cubic root of 99972135 is about 464.1157667319.

The spelling of 99972135 in words is "ninety-nine million, nine hundred seventy-two thousand, one hundred thirty-five".