139744917 has 36 divisors (see below), whose sum is σ = 221532480. Its totient is φ = 84835296.

The previous prime is 139744907. The next prime is 139744937. The reversal of 139744917 is 719447931.

It is not a de Polignac number, because 139744917 - 2⁶ = 139744853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139744907) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 119578 + ... + 120740.

It is an arithmetic number, because the mean of its divisors is an integer number (6153680).

Almost surely, 2^139744917 is an apocalyptic number.

It is an amenable number.

139744917 is a deficient number, since it is larger than the sum of its proper divisors (81787563).

139744917 is a wasteful number, since it uses less digits than its factorization.

139744917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1258 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 139744917 is about 11821.3754275888. The cubic root of 139744917 is about 518.9338572753.

The spelling of 139744917 in words is "one hundred thirty-nine million, seven hundred forty-four thousand, nine hundred seventeen".