39440857 has 2 divisors, whose sum is σ = 39440858. Its totient is φ = 39440856.

The previous prime is 39440813. The next prime is 39440873. The reversal of 39440857 is 75804493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 5089536 = 5861^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 39440857 - 2²³ = 31052249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39440057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19720428 + 19720429.

It is an arithmetic number, because the mean of its divisors is an integer number (19720429).

Almost surely, 2^39440857 is an apocalyptic number.

It is an amenable number.

39440857 is a deficient number, since it is larger than the sum of its proper divisors (1).

39440857 is an equidigital number, since it uses as much as digits as its factorization.

39440857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 39440857 is about 6280.1956179724. The cubic root of 39440857 is about 340.3941708785.

It can be divided in two parts, 39 and 440857, that added together give a square (440896 = 664²).

The spelling of 39440857 in words is "thirty-nine million, four hundred forty thousand, eight hundred fifty-seven".