861379443 has 24 divisors (see below), whose sum is σ = 1321686288. Its totient is φ = 538716672.

The previous prime is 861379429. The next prime is 861379501. The reversal of 861379443 is 344973168.

It is not a de Polignac number, because 861379443 - 2⁵ = 861379411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861379843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38896 + ... + 56882.

It is an arithmetic number, because the mean of its divisors is an integer number (55070262).

Almost surely, 2^861379443 is an apocalyptic number.

861379443 is a deficient number, since it is larger than the sum of its proper divisors (460306845).

861379443 is a wasteful number, since it uses less digits than its factorization.

861379443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18323 (or 18320 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 861379443 is about 29349.2664814642. The cubic root of 861379443 is about 951.4767219806.

The spelling of 861379443 in words is "eight hundred sixty-one million, three hundred seventy-nine thousand, four hundred forty-three".