37739639821 has 12 divisors (see below), whose sum is σ = 43174071892. Its totient is φ = 32787376128.

The previous prime is 37739639809. The next prime is 37739639831. The reversal of 37739639821 is 12893693773.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 27941796 + 37711698025 = 5286^2 + 194195^2 .

It is not a de Polignac number, because 37739639821 - 2¹⁷ = 37739508749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37739639831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5018820 + ... + 5026333.

Almost surely, 2^37739639821 is an apocalyptic number.

It is an amenable number.

37739639821 is a deficient number, since it is larger than the sum of its proper divisors (5434432071).

37739639821 is a wasteful number, since it uses less digits than its factorization.

37739639821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10045200 (or 10045183 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 58.

The spelling of 37739639821 in words is "thirty-seven billion, seven hundred thirty-nine million, six hundred thirty-nine thousand, eight hundred twenty-one".