39918042025 has 27 divisors (see below), whose sum is σ = 51186311013. Its totient is φ = 30880315200.

The previous prime is 39918042019. The next prime is 39918042041. The reversal of 39918042025 is 52024081993.

The square root of 39918042025 is 199795.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1484792089 + 38433249936 = 38533^2 + 196044^2 .

It is not a de Polignac number, because 39918042025 - 2¹³ = 39918033833 is a prime.

It is a super-2 number, since 2×39918042025² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 30967581 + ... + 30968869.

Almost surely, 2^39918042025 is an apocalyptic number.

39918042025 is the 199795-th square number.

39918042025 is the 99898-th centered octagonal number.

It is an amenable number.

39918042025 is a deficient number, since it is larger than the sum of its proper divisors (11268268988).

39918042025 is an frugal number, since it uses more digits than its factorization.

39918042025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 39918042025 in words is "thirty-nine billion, nine hundred eighteen million, forty-two thousand, twenty-five".