1939692021 has 12 divisors (see below), whose sum is σ = 2641995072. Its totient is φ = 1265273424.

The previous prime is 1939692011. The next prime is 1939692037. The reversal of 1939692021 is 1202969391.

It is not a de Polignac number, because 1939692021 - 2¹⁷ = 1939560949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939692011) 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, 521115 + ... + 524823.

It is an arithmetic number, because the mean of its divisors is an integer number (220166256).

Almost surely, 2^1939692021 is an apocalyptic number.

It is an amenable number.

1939692021 is a deficient number, since it is larger than the sum of its proper divisors (702303051).

1939692021 is an frugal number, since it uses more digits than its factorization.

1939692021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468 (or 3759 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 1939692021 is about 44041.9348008236. The cubic root of 1939692021 is about 1247.1277027956.

The spelling of 1939692021 in words is "one billion, nine hundred thirty-nine million, six hundred ninety-two thousand, twenty-one".