38686690 has 32 divisors (see below), whose sum is σ = 83047680. Its totient is φ = 12686784.

The previous prime is 38686673. The next prime is 38686699. The reversal of 38686690 is 9668683.

It is a happy number.

It is a super-2 number, since 2×38686690² = 2993319966312200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 38686690.

It is not an unprimeable number, because it can be changed into a prime (38686699) 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, 10405 + ... + 13624.

It is an arithmetic number, because the mean of its divisors is an integer number (2595240).

Almost surely, 2^38686690 is an apocalyptic number.

38686690 is an abundant number, since it is smaller than the sum of its proper divisors (44360990).

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

38686690 is a wasteful number, since it uses less digits than its factorization.

38686690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24066.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 38686690 is about 6219.8625386740. The cubic root of 38686690 is about 338.2105815193.

The spelling of 38686690 in words is "thirty-eight million, six hundred eighty-six thousand, six hundred ninety".