39405649 has 2 divisors, whose sum is σ = 39405650. Its totient is φ = 39405648.

The previous prime is 39405631. The next prime is 39405671. The reversal of 39405649 is 94650493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26337424 + 13068225 = 5132^2 + 3615^2 .

It is a cyclic number.

It is not a de Polignac number, because 39405649 - 2¹⁵ = 39372881 is a prime.

It is a super-2 number, since 2×39405649² = 3105610346222402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39405689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19702824 + 19702825.

It is an arithmetic number, because the mean of its divisors is an integer number (19702825).

Almost surely, 2^39405649 is an apocalyptic number.

It is an amenable number.

39405649 is a deficient number, since it is larger than the sum of its proper divisors (1).

39405649 is an equidigital number, since it uses as much as digits as its factorization.

39405649 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 39405649 is about 6277.3918947283. The cubic root of 39405649 is about 340.2928532198.

The spelling of 39405649 in words is "thirty-nine million, four hundred five thousand, six hundred forty-nine".