39905538 has 16 divisors (see below), whose sum is σ = 81509760. Its totient is φ = 13018736.

The previous prime is 39905533. The next prime is 39905557. The reversal of 39905538 is 83550993.

It is a self number, because there is not a number n which added to its sum of digits gives 39905538.

It is not an unprimeable number, because it can be changed into a prime (39905533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70473 + ... + 71036.

It is an arithmetic number, because the mean of its divisors is an integer number (5094360).

Almost surely, 2^39905538 is an apocalyptic number.

39905538 is an abundant number, since it is smaller than the sum of its proper divisors (41604222).

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

39905538 is a wasteful number, since it uses less digits than its factorization.

39905538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141561.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 39905538 is about 6317.0830293736. The cubic root of 39905538 is about 341.7257642238.

The spelling of 39905538 in words is "thirty-nine million, nine hundred five thousand, five hundred thirty-eight".