387979643 has 4 divisors (see below), whose sum is σ = 388031280. Its totient is φ = 387928008.

The previous prime is 387979621. The next prime is 387979667. The reversal of 387979643 is 346979783.

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

It is a cyclic number.

It is not a de Polignac number, because 387979643 - 2²⁴ = 371202427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387979673) 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, 12128 + ... + 30381.

It is an arithmetic number, because the mean of its divisors is an integer number (97007820).

Almost surely, 2^387979643 is an apocalyptic number.

387979643 is a deficient number, since it is larger than the sum of its proper divisors (51637).

387979643 is an equidigital number, since it uses as much as digits as its factorization.

387979643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51636.

The product of its digits is 6858432, while the sum is 56.

The square root of 387979643 is about 19697.1988617671. The cubic root of 387979643 is about 729.3505470418.

The spelling of 387979643 in words is "three hundred eighty-seven million, nine hundred seventy-nine thousand, six hundred forty-three".