139561456 has 20 divisors (see below), whose sum is σ = 279725400. Its totient is φ = 67374272.

The previous prime is 139561453. The next prime is 139561459. The reversal of 139561456 is 654165931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (139561453) and next prime (139561459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139561451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149926 + ... + 150853.

It is an arithmetic number, because the mean of its divisors is an integer number (13986270).

Almost surely, 2^139561456 is an apocalyptic number.

139561456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

139561456 is an abundant number, since it is smaller than the sum of its proper divisors (140163944).

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

139561456 is a wasteful number, since it uses less digits than its factorization.

139561456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300816 (or 300810 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The square root of 139561456 is about 11813.6131644811. The cubic root of 139561456 is about 518.7066675761.

The spelling of 139561456 in words is "one hundred thirty-nine million, five hundred sixty-one thousand, four hundred fifty-six".