396861539 has 4 divisors (see below), whose sum is σ = 396928920. Its totient is φ = 396794160.

The previous prime is 396861533. The next prime is 396861557. The reversal of 396861539 is 935168693.

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 396861539 - 2²⁴ = 380084323 is a prime.

It is a super-2 number, since 2×396861539² = 314998162274897042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396861533) 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, 23909 + ... + 36950.

It is an arithmetic number, because the mean of its divisors is an integer number (99232230).

Almost surely, 2^396861539 is an apocalyptic number.

396861539 is a deficient number, since it is larger than the sum of its proper divisors (67381).

396861539 is an equidigital number, since it uses as much as digits as its factorization.

396861539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67380.

The product of its digits is 1049760, while the sum is 50.

The square root of 396861539 is about 19921.3839629680. The cubic root of 396861539 is about 734.8742061856.

The spelling of 396861539 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, five hundred thirty-nine".