38731990 has 16 divisors (see below), whose sum is σ = 76055760. Its totient is φ = 14084320.

The previous prime is 38731981. The next prime is 38731997. The reversal of 38731990 is 9913783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38731997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175945 + ... + 176164.

It is an arithmetic number, because the mean of its divisors is an integer number (4753485).

Almost surely, 2^38731990 is an apocalyptic number.

38731990 is a deficient number, since it is larger than the sum of its proper divisors (37323770).

38731990 is a wasteful number, since it uses less digits than its factorization.

38731990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352127.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 38731990 is about 6223.5030328586. The cubic root of 38731990 is about 338.3425387310.

The spelling of 38731990 in words is "thirty-eight million, seven hundred thirty-one thousand, nine hundred ninety".