39520290 has 32 divisors (see below), whose sum is σ = 95795136. Its totient is φ = 10433600.

The previous prime is 39520289. The next prime is 39520297. The reversal of 39520290 is 9202593.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (39520297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3492 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (2993598).

Almost surely, 2^39520290 is an apocalyptic number.

39520290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

39520290 is an abundant number, since it is smaller than the sum of its proper divisors (56274846).

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

39520290 is a wasteful number, since it uses less digits than its factorization.

39520290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13154.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 39520290 is about 6286.5165234810. The cubic root of 39520290 is about 340.6225330461.

The spelling of 39520290 in words is "thirty-nine million, five hundred twenty thousand, two hundred ninety".