99405657 has 16 divisors (see below), whose sum is σ = 158596480. Its totient is φ = 61172496.

The previous prime is 99405653. The next prime is 99405703. The reversal of 99405657 is 75650499.

It is a happy number.

It is not a de Polignac number, because 99405657 - 2² = 99405653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99405653) 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 15 ways as a sum of consecutive naturals, for example, 141253 + ... + 141954.

It is an arithmetic number, because the mean of its divisors is an integer number (9912280).

Almost surely, 2^99405657 is an apocalyptic number.

It is an amenable number.

99405657 is a deficient number, since it is larger than the sum of its proper divisors (59190823).

99405657 is a wasteful number, since it uses less digits than its factorization.

99405657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283229 (or 283223 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 99405657 is about 9970.2385628429. The cubic root of 99405657 is about 463.2374902540.

The spelling of 99405657 in words is "ninety-nine million, four hundred five thousand, six hundred fifty-seven".