139578397 has 16 divisors (see below), whose sum is σ = 161782272. Its totient is φ = 117952560.

The previous prime is 139578377. The next prime is 139578419. The reversal of 139578397 is 793875931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 139578397 - 2⁷ = 139578269 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 (139578377) 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, 247638 + ... + 248200.

It is an arithmetic number, because the mean of its divisors is an integer number (10111392).

Almost surely, 2^139578397 is an apocalyptic number.

It is an amenable number.

139578397 is a deficient number, since it is larger than the sum of its proper divisors (22203875).

139578397 is a wasteful number, since it uses less digits than its factorization.

139578397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

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

The square root of 139578397 is about 11814.3301545200. The cubic root of 139578397 is about 518.7276548753.

The spelling of 139578397 in words is "one hundred thirty-nine million, five hundred seventy-eight thousand, three hundred ninety-seven".