139268557 has 4 divisors (see below), whose sum is σ = 139810716. Its totient is φ = 138726400.

The previous prime is 139268543. The next prime is 139268603. The reversal of 139268557 is 755862931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755862931 = 29 ⋅26064239.

It can be written as a sum of positive squares in 2 ways, for example, as 62425801 + 76842756 = 7901^2 + 8766^2 .

It is a cyclic number.

It is not a de Polignac number, because 139268557 - 2¹⁹ = 138744269 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 (139268057) 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, 270694 + ... + 271207.

It is an arithmetic number, because the mean of its divisors is an integer number (34952679).

Almost surely, 2^139268557 is an apocalyptic number.

It is an amenable number.

139268557 is a deficient number, since it is larger than the sum of its proper divisors (542159).

139268557 is an equidigital number, since it uses as much as digits as its factorization.

139268557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542158.

The product of its digits is 453600, while the sum is 46.

The square root of 139268557 is about 11801.2099803368. The cubic root of 139268557 is about 518.3435418311.

The spelling of 139268557 in words is "one hundred thirty-nine million, two hundred sixty-eight thousand, five hundred fifty-seven".