38402139621 has 16 divisors (see below), whose sum is σ = 52471637504. Its totient is φ = 24974454384.

The previous prime is 38402139583. The next prime is 38402139637. The reversal of 38402139621 is 12693120483.

38402139621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38402139621 - 2⁶ = 38402139557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38402139621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38402139641) 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, 906751 + ... + 948156.

It is an arithmetic number, because the mean of its divisors is an integer number (3279477344).

Almost surely, 2^38402139621 is an apocalyptic number.

It is an amenable number.

38402139621 is a deficient number, since it is larger than the sum of its proper divisors (14069497883).

38402139621 is a wasteful number, since it uses less digits than its factorization.

38402139621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855080.

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 38402139621 in words is "thirty-eight billion, four hundred two million, one hundred thirty-nine thousand, six hundred twenty-one".