139798537 has 4 divisors (see below), whose sum is σ = 139909120. Its totient is φ = 139687956.

The previous prime is 139798507. The next prime is 139798541. The reversal of 139798537 is 735897931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735897931 = 5573 ⋅132047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139798537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139798507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53373 + ... + 55930.

It is an arithmetic number, because the mean of its divisors is an integer number (34977280).

Almost surely, 2^139798537 is an apocalyptic number.

It is an amenable number.

139798537 is a deficient number, since it is larger than the sum of its proper divisors (110583).

139798537 is a wasteful number, since it uses less digits than its factorization.

139798537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110582.

The product of its digits is 1428840, while the sum is 52.

The square root of 139798537 is about 11823.6431356837. The cubic root of 139798537 is about 519.0002202743. Note that the first 3 decimals are identical.

The spelling of 139798537 in words is "one hundred thirty-nine million, seven hundred ninety-eight thousand, five hundred thirty-seven".