39725869 has 2 divisors, whose sum is σ = 39725870. Its totient is φ = 39725868.

The previous prime is 39725831. The next prime is 39725879. The reversal of 39725869 is 96852793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37970244 + 1755625 = 6162^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 39725869 - 2¹³ = 39717677 is a prime.

It is a super-2 number, since 2×39725869² = 3156289335610322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39725879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19862934 + 19862935.

It is an arithmetic number, because the mean of its divisors is an integer number (19862935).

Almost surely, 2^39725869 is an apocalyptic number.

It is an amenable number.

39725869 is a deficient number, since it is larger than the sum of its proper divisors (1).

39725869 is an equidigital number, since it uses as much as digits as its factorization.

39725869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 39725869 is about 6302.8461031505. The cubic root of 39725869 is about 341.2121354133.

The spelling of 39725869 in words is "thirty-nine million, seven hundred twenty-five thousand, eight hundred sixty-nine".