861885402 has 24 divisors (see below), whose sum is σ = 2005203456. Its totient is φ = 246252888.

The previous prime is 861885379. The next prime is 861885439. The reversal of 861885402 is 204588168.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1465498 + ... + 1466085.

It is an arithmetic number, because the mean of its divisors is an integer number (83550144).

Almost surely, 2^861885402 is an apocalyptic number.

861885402 is an abundant number, since it is smaller than the sum of its proper divisors (1143318054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861885402 is a wasteful number, since it uses less digits than its factorization.

861885402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931602 (or 2931595 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 861885402 is about 29357.8848352534. The cubic root of 861885402 is about 951.6629790316.

The spelling of 861885402 in words is "eight hundred sixty-one million, eight hundred eighty-five thousand, four hundred two".