99870155 has 32 divisors (see below), whose sum is σ = 158215680. Its totient is φ = 58590720.

The previous prime is 99870149. The next prime is 99870167. The reversal of 99870155 is 55107899.

It is a happy number.

It is not a de Polignac number, because 99870155 - 2¹⁰ = 99869131 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1085 + ... + 14174.

It is an arithmetic number, because the mean of its divisors is an integer number (4944240).

Almost surely, 2^99870155 is an apocalyptic number.

99870155 is a deficient number, since it is larger than the sum of its proper divisors (58345525).

99870155 is a wasteful number, since it uses less digits than its factorization.

99870155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15299.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 99870155 is about 9993.5056411652. The cubic root of 99870155 is about 463.9579006468.

The spelling of 99870155 in words is "ninety-nine million, eight hundred seventy thousand, one hundred fifty-five".