39400997 has 2 divisors, whose sum is σ = 39400998. Its totient is φ = 39400996.

The previous prime is 39400973. The next prime is 39401017. The reversal of 39400997 is 79900493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23512801 + 15888196 = 4849^2 + 3986^2 .

It is a cyclic number.

It is not a de Polignac number, because 39400997 - 2⁸ = 39400741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39400297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19700498 + 19700499.

It is an arithmetic number, because the mean of its divisors is an integer number (19700499).

Almost surely, 2^39400997 is an apocalyptic number.

It is an amenable number.

39400997 is a deficient number, since it is larger than the sum of its proper divisors (1).

39400997 is an equidigital number, since it uses as much as digits as its factorization.

39400997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 39400997 is about 6277.0213477413. The cubic root of 39400997 is about 340.2794616994.

The spelling of 39400997 in words is "thirty-nine million, four hundred thousand, nine hundred ninety-seven".