39872257 has 2 divisors, whose sum is σ = 39872258. Its totient is φ = 39872256.

The previous prime is 39872249. The next prime is 39872263. The reversal of 39872257 is 75227893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22240656 + 17631601 = 4716^2 + 4199^2 .

It is a cyclic number.

It is not a de Polignac number, because 39872257 - 2³ = 39872249 is a prime.

It is not a weakly prime, because it can be changed into another prime (39872207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19936128 + 19936129.

It is an arithmetic number, because the mean of its divisors is an integer number (19936129).

Almost surely, 2^39872257 is an apocalyptic number.

It is an amenable number.

39872257 is a deficient number, since it is larger than the sum of its proper divisors (1).

39872257 is an equidigital number, since it uses as much as digits as its factorization.

39872257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 39872257 is about 6314.4482736024. The cubic root of 39872257 is about 341.6307386638.

The spelling of 39872257 in words is "thirty-nine million, eight hundred seventy-two thousand, two hundred fifty-seven".