1639000388 has 12 divisors (see below), whose sum is σ = 2869343232. Its totient is φ = 819188040.

The previous prime is 1639000387. The next prime is 1639000501. The reversal of 1639000388 is 8830009361.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1639000387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66020 + ... + 87387.

It is an arithmetic number, because the mean of its divisors is an integer number (239111936).

Almost surely, 2^1639000388 is an apocalyptic number.

It is an amenable number.

1639000388 is a deficient number, since it is larger than the sum of its proper divisors (1230342844).

1639000388 is a wasteful number, since it uses less digits than its factorization.

1639000388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156082 (or 156080 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1639000388 is about 40484.5697519438. The cubic root of 1639000388 is about 1179.0340625195.

The spelling of 1639000388 in words is "one billion, six hundred thirty-nine million, three hundred eighty-eight", and thus it is an aban number.