139643649 has 16 divisors (see below), whose sum is σ = 215875200. Its totient is φ = 89047728.

The previous prime is 139643633. The next prime is 139643659. The reversal of 139643649 is 946346931.

It is not a de Polignac number, because 139643649 - 2⁴ = 139643633 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139643659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111814 + ... + 113055.

It is an arithmetic number, because the mean of its divisors is an integer number (13492200).

Almost surely, 2^139643649 is an apocalyptic number.

It is an amenable number.

139643649 is a deficient number, since it is larger than the sum of its proper divisors (76231551).

139643649 is a wasteful number, since it uses less digits than its factorization.

139643649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224901 (or 224895 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 139643649 is about 11817.0913934013. The cubic root of 139643649 is about 518.8084762260.

The spelling of 139643649 in words is "one hundred thirty-nine million, six hundred forty-three thousand, six hundred forty-nine".