39902669 has 2 divisors, whose sum is σ = 39902670. Its totient is φ = 39902668.

The previous prime is 39902617. The next prime is 39902701. The reversal of 39902669 is 96620993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38912644 + 990025 = 6238^2 + 995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39902669 is a prime.

It is a super-2 number, since 2×39902669² = 3184445986647122, 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 (39902609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19951334 + 19951335.

It is an arithmetic number, because the mean of its divisors is an integer number (19951335).

Almost surely, 2^39902669 is an apocalyptic number.

It is an amenable number.

39902669 is a deficient number, since it is larger than the sum of its proper divisors (1).

39902669 is an equidigital number, since it uses as much as digits as its factorization.

39902669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 39902669 is about 6316.8559426348. The cubic root of 39902669 is about 341.7175745943.

The spelling of 39902669 in words is "thirty-nine million, nine hundred two thousand, six hundred sixty-nine".