39957439 has 2 divisors, whose sum is σ = 39957440. Its totient is φ = 39957438.

The previous prime is 39957431. The next prime is 39957457. The reversal of 39957439 is 93475993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39957439 - 2³ = 39957431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39957392 and 39957401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39957431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19978719 + 19978720.

It is an arithmetic number, because the mean of its divisors is an integer number (19978720).

Almost surely, 2^39957439 is an apocalyptic number.

39957439 is a deficient number, since it is larger than the sum of its proper divisors (1).

39957439 is an equidigital number, since it uses as much as digits as its factorization.

39957439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 49.

The square root of 39957439 is about 6321.1896823304. The cubic root of 39957439 is about 341.8738491450.

The spelling of 39957439 in words is "thirty-nine million, nine hundred fifty-seven thousand, four hundred thirty-nine".