139156457 has 4 divisors (see below), whose sum is σ = 151807056. Its totient is φ = 126505860.

The previous prime is 139156447. The next prime is 139156531. The reversal of 139156457 is 754651931.

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: 754651931 = 11 ⋅68604721.

It is a cyclic number.

It is not a de Polignac number, because 139156457 - 2⁶ = 139156393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139156447) 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, 6325283 + ... + 6325304.

It is an arithmetic number, because the mean of its divisors is an integer number (37951764).

Almost surely, 2^139156457 is an apocalyptic number.

It is an amenable number.

139156457 is a deficient number, since it is larger than the sum of its proper divisors (12650599).

139156457 is a wasteful number, since it uses less digits than its factorization.

139156457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12650598.

The product of its digits is 113400, while the sum is 41.

The square root of 139156457 is about 11796.4595112262. The cubic root of 139156457 is about 518.2044295299.

The spelling of 139156457 in words is "one hundred thirty-nine million, one hundred fifty-six thousand, four hundred fifty-seven".