139561644 has 12 divisors (see below), whose sum is σ = 325643864. Its totient is φ = 46520544.

The previous prime is 139561633. The next prime is 139561649. The reversal of 139561644 is 446165931.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×139561644³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (139561649) 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, 5815057 + ... + 5815080.

Almost surely, 2^139561644 is an apocalyptic number.

It is an amenable number.

139561644 is an abundant number, since it is smaller than the sum of its proper divisors (186082220).

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

139561644 is a wasteful number, since it uses less digits than its factorization.

139561644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11630144 (or 11630142 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 139561644 is about 11813.6211214005. The cubic root of 139561644 is about 518.7069004885.

The spelling of 139561644 in words is "one hundred thirty-nine million, five hundred sixty-one thousand, six hundred forty-four".