139291637 has 8 divisors (see below), whose sum is σ = 144027072. Its totient is φ = 134620000.

The previous prime is 139291631. The next prime is 139291661. The reversal of 139291637 is 736192931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139291637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139291594 and 139291603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139291631) 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, 11489 + ... + 20262.

It is an arithmetic number, because the mean of its divisors is an integer number (18003384).

Almost surely, 2^139291637 is an apocalyptic number.

It is an amenable number.

139291637 is a deficient number, since it is larger than the sum of its proper divisors (4735435).

139291637 is a wasteful number, since it uses less digits than its factorization.

139291637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31899.

The product of its digits is 61236, while the sum is 41.

The square root of 139291637 is about 11802.1878056571. The cubic root of 139291637 is about 518.3721740612.

The spelling of 139291637 in words is "one hundred thirty-nine million, two hundred ninety-one thousand, six hundred thirty-seven".