38404621 has 2 divisors, whose sum is σ = 38404622. Its totient is φ = 38404620.

The previous prime is 38404609. The next prime is 38404627. The reversal of 38404621 is 12640483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35271721 + 3132900 = 5939^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 38404621 - 2⁷ = 38404493 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38404621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38404627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19202310 + 19202311.

It is an arithmetic number, because the mean of its divisors is an integer number (19202311).

Almost surely, 2^38404621 is an apocalyptic number.

It is an amenable number.

38404621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38404621 is an equidigital number, since it uses as much as digits as its factorization.

38404621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 38404621 is about 6197.1461980496. The cubic root of 38404621 is about 337.3865985721.

The spelling of 38404621 in words is "thirty-eight million, four hundred four thousand, six hundred twenty-one".