139726631 has 8 divisors (see below), whose sum is σ = 152747904. Its totient is φ = 126758520.

The previous prime is 139726597. The next prime is 139726637. The reversal of 139726631 is 136627931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139726631 - 2⁶ = 139726567 is a prime.

It is a super-2 number, since 2×139726631² = 39047062821220322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139726637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7685 + ... + 18398.

It is an arithmetic number, because the mean of its divisors is an integer number (19093488).

Almost surely, 2^139726631 is an apocalyptic number.

139726631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139726631 is a deficient number, since it is larger than the sum of its proper divisors (13021273).

139726631 is a wasteful number, since it uses less digits than its factorization.

139726631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26581.

The product of its digits is 40824, while the sum is 38.

The square root of 139726631 is about 11820.6019728269. The cubic root of 139726631 is about 518.9112216555.

The spelling of 139726631 in words is "one hundred thirty-nine million, seven hundred twenty-six thousand, six hundred thirty-one".