39990155 has 32 divisors (see below), whose sum is σ = 53698560. Its totient is φ = 28460160.

The previous prime is 39990133. The next prime is 39990157. The reversal of 39990155 is 55109993.

It is not a de Polignac number, because 39990155 - 2¹² = 39986059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39990157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108782 + ... + 109148.

It is an arithmetic number, because the mean of its divisors is an integer number (1678080).

Almost surely, 2^39990155 is an apocalyptic number.

39990155 is a deficient number, since it is larger than the sum of its proper divisors (13708405).

39990155 is a wasteful number, since it uses less digits than its factorization.

39990155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 39990155 is about 6323.7769568510. The cubic root of 39990155 is about 341.9671291778.

The spelling of 39990155 in words is "thirty-nine million, nine hundred ninety thousand, one hundred fifty-five".