39069870921 has 27 divisors (see below), whose sum is σ = 57880292743.
Its totient is φ = 25395485280.
The previous prime is 39069870911. The next prime is 39069870937. The reversal of 39069870921 is 12907896093.
The square root of 39069870921 is 197661.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 1882605321 + 37187265600 = 43389^2 + 192840^2
It is not a de Polignac number, because 39069870921 - 27 = 39069870793 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (39069870911) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 24311500 + ... + 24313106.
Almost surely, 239069870921 is an apocalyptic number.
39069870921 is the 197661-st square number.
39069870921 is the 98831-st centered octagonal number.
It is an amenable number.
39069870921 is a deficient number, since it is larger than the sum of its proper divisors (18810421822).
39069870921 is an frugal number, since it uses more digits than its factorization.
39069870921 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3302 (or 1651 counting only the distinct ones).
The product of its (nonzero) digits is 1469664, while the sum is 54.
The spelling of 39069870921 in words is "thirty-nine billion, sixty-nine million, eight hundred seventy thousand, nine hundred twenty-one".