139534457 has 4 divisors (see below), whose sum is σ = 144346020. Its totient is φ = 134722896.

The previous prime is 139534433. The next prime is 139534471. The reversal of 139534457 is 754435931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754435931 = 4639 ⋅162629.

It can be written as a sum of positive squares in 2 ways, for example, as 85673536 + 53860921 = 9256^2 + 7339^2 .

It is a cyclic number.

It is not a de Polignac number, because 139534457 - 2⁶ = 139534393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139536457) 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, 2405738 + ... + 2405795.

It is an arithmetic number, because the mean of its divisors is an integer number (36086505).

Almost surely, 2^139534457 is an apocalyptic number.

It is an amenable number.

139534457 is a deficient number, since it is larger than the sum of its proper divisors (4811563).

139534457 is an equidigital number, since it uses as much as digits as its factorization.

139534457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4811562.

The product of its digits is 226800, while the sum is 41.

The square root of 139534457 is about 11812.4704020793. The cubic root of 139534457 is about 518.6732164478.

The spelling of 139534457 in words is "one hundred thirty-nine million, five hundred thirty-four thousand, four hundred fifty-seven".