38506639 has 2 divisors, whose sum is σ = 38506640. Its totient is φ = 38506638.

The previous prime is 38506621. The next prime is 38506687. The reversal of 38506639 is 93660583.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38506639 - 2⁵ = 38506607 is a prime.

It is a super-2 number, since 2×38506639² = 2965522494152642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38536639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19253319 + 19253320.

It is an arithmetic number, because the mean of its divisors is an integer number (19253320).

Almost surely, 2^38506639 is an apocalyptic number.

38506639 is a deficient number, since it is larger than the sum of its proper divisors (1).

38506639 is an equidigital number, since it uses as much as digits as its factorization.

38506639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 38506639 is about 6205.3717857998. The cubic root of 38506639 is about 337.6850789173.

The spelling of 38506639 in words is "thirty-eight million, five hundred six thousand, six hundred thirty-nine".