379982399136521 has 4 divisors (see below), whose sum is σ = 379983923870532. Its totient is φ = 379980874402512.

The previous prime is 379982399136491. The next prime is 379982399136539. The reversal of 379982399136521 is 125631993289973.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142249512385600 + 237732886750921 = 11926840^2 + 15418589^2 .

It is a cyclic number.

It is not a de Polignac number, because 379982399136521 - 2³⁸ = 379707521229577 is a prime.

It is a super-4 number, since 4×379982399136521⁴ (a number of 59 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (379982399136551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761993126 + ... + 762491631.

It is an arithmetic number, because the mean of its divisors is an integer number (94995980967633).

Almost surely, 2^{379982399136521} is an apocalyptic number.

It is an amenable number.

379982399136521 is a deficient number, since it is larger than the sum of its proper divisors (1524734011).

379982399136521 is a wasteful number, since it uses less digits than its factorization.

379982399136521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524734010.

The product of its digits is 1190427840, while the sum is 77.

The spelling of 379982399136521 in words is "three hundred seventy-nine trillion, nine hundred eighty-two billion, three hundred ninety-nine million, one hundred thirty-six thousand, five hundred twenty-one".