38641690 has 32 divisors (see below), whose sum is σ = 71954064. Its totient is φ = 14929920.

The previous prime is 38641667. The next prime is 38641693. The reversal of 38641690 is 9614683.

It can be written as a sum of positive squares in 8 ways, for example, as 25674489 + 12967201 = 5067^2 + 3601^2 .

It is a super-2 number, since 2×38641690² = 2986360412112200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (38641693) 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, 66682 + ... + 67258.

Almost surely, 2^38641690 is an apocalyptic number.

38641690 is a deficient number, since it is larger than the sum of its proper divisors (33312374).

38641690 is a wasteful number, since it uses less digits than its factorization.

38641690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 38641690 is about 6216.2440428284. The cubic root of 38641690 is about 338.0793961681.

The spelling of 38641690 in words is "thirty-eight million, six hundred forty-one thousand, six hundred ninety".