139641645 has 32 divisors (see below), whose sum is σ = 262491264. Its totient is φ = 62496000.

The previous prime is 139641637. The next prime is 139641661. The reversal of 139641645 is 546146931.

It is not a de Polignac number, because 139641645 - 2³ = 139641637 is a prime.

It is a super-3 number, since 3×139641645³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30406 + ... + 34695.

It is an arithmetic number, because the mean of its divisors is an integer number (8202852).

Almost surely, 2^139641645 is an apocalyptic number.

139641645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139641645 is a deficient number, since it is larger than the sum of its proper divisors (122849619).

139641645 is a wasteful number, since it uses less digits than its factorization.

139641645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65133.

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

The square root of 139641645 is about 11817.0066006582. The cubic root of 139641645 is about 518.8059944395.

The spelling of 139641645 in words is "one hundred thirty-nine million, six hundred forty-one thousand, six hundred forty-five".