39180639481 has 9 divisors (see below), whose sum is σ = 39508158469. Its totient is φ = 38855818300.

The previous prime is 39180639427. The next prime is 39180639529. The reversal of 39180639481 is 18493608193.

It is a happy number.

The square root of 39180639481 is 197941.

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

It is not a de Polignac number, because 39180639481 - 2⁹ = 39180638969 is a prime.

It is a super-2 number, since 2×39180639481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39180639181) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25929516 + ... + 25931026.

Almost surely, 2^39180639481 is an apocalyptic number.

39180639481 is the 197941-st square number.

39180639481 is the 98971-st centered octagonal number.

It is an amenable number.

39180639481 is a deficient number, since it is larger than the sum of its proper divisors (327518988).

39180639481 is an frugal number, since it uses more digits than its factorization.

39180639481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 39180639481 in words is "thirty-nine billion, one hundred eighty million, six hundred thirty-nine thousand, four hundred eighty-one".