1972336921 has 9 divisors (see below), whose sum is σ = 1998752511. Its totient is φ = 1946267664.

The previous prime is 1972336907. The next prime is 1972336931. The reversal of 1972336921 is 1296332791.

The square root of 1972336921 is 44411.

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., 378730521 + 1593606400 = 19461^2 + 39920^2 .

It is not a de Polignac number, because 1972336921 - 2⁹ = 1972336409 is a prime.

It is a super-2 number, since 2×1972336921² = 7780225859879520482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1972336931) 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, 3952330 + ... + 3952828.

Almost surely, 2^1972336921 is an apocalyptic number.

1972336921 is the 44411-st square number.

1972336921 is the 22206-th centered octagonal number.

It is an amenable number.

1972336921 is a deficient number, since it is larger than the sum of its proper divisors (26415590).

1972336921 is an frugal number, since it uses more digits than its factorization.

1972336921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 588 counting only the distinct ones).

The product of its digits is 122472, while the sum is 43.

The cubic root of 1972336921 is about 1254.0851776612.

It can be divided in two parts, 19723 and 36921, that added together give a square (56644 = 238²).

The spelling of 1972336921 in words is "one billion, nine hundred seventy-two million, three hundred thirty-six thousand, nine hundred twenty-one".