139726917 has 16 divisors (see below), whose sum is σ = 225821760. Its totient is φ = 84682800.

The previous prime is 139726907. The next prime is 139726949. The reversal of 139726917 is 719627931.

It is not a de Polignac number, because 139726917 - 2¹⁰ = 139725893 is a prime.

It is a super-2 number, since 2×139726917² = 39047222668649778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139726907) 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, 234934 + ... + 235527.

It is an arithmetic number, because the mean of its divisors is an integer number (14113860).

Almost surely, 2^139726917 is an apocalyptic number.

It is an amenable number.

139726917 is a deficient number, since it is larger than the sum of its proper divisors (86094843).

139726917 is a wasteful number, since it uses less digits than its factorization.

139726917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470481 (or 470475 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 139726917 is about 11820.6140703434. The cubic root of 139726917 is about 518.9115757004.

The spelling of 139726917 in words is "one hundred thirty-nine million, seven hundred twenty-six thousand, nine hundred seventeen".