139492397 has 4 divisors (see below), whose sum is σ = 152173536. Its totient is φ = 126811260.

The previous prime is 139492391. The next prime is 139492399. The reversal of 139492397 is 793294931.

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.

It is a cyclic number.

It is not a de Polignac number, because 139492397 - 2⁶ = 139492333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139492391) 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, 6340553 + ... + 6340574.

It is an arithmetic number, because the mean of its divisors is an integer number (38043384).

Almost surely, 2^139492397 is an apocalyptic number.

It is an amenable number.

139492397 is a deficient number, since it is larger than the sum of its proper divisors (12681139).

139492397 is a wasteful number, since it uses less digits than its factorization.

139492397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12681138.

The product of its digits is 367416, while the sum is 47.

The square root of 139492397 is about 11810.6899459769. The cubic root of 139492397 is about 518.6210964953.

It can be divided in two parts, 13949 and 2397, that multiplied together give a triangular number (33435753 = T₈₁₇₇).

The spelling of 139492397 in words is "one hundred thirty-nine million, four hundred ninety-two thousand, three hundred ninety-seven".