139433557 has 4 divisors (see below), whose sum is σ = 139521196. Its totient is φ = 139345920.

The previous prime is 139433543. The next prime is 139433561. The reversal of 139433557 is 755334931.

139433557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102394161 + 37039396 = 10119^2 + 6086^2 .

It is a cyclic number.

It is not a de Polignac number, because 139433557 - 2¹⁹ = 138909269 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 (139433587) 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, 41388 + ... + 44629.

It is an arithmetic number, because the mean of its divisors is an integer number (34880299).

Almost surely, 2^139433557 is an apocalyptic number.

It is an amenable number.

139433557 is a deficient number, since it is larger than the sum of its proper divisors (87639).

139433557 is an equidigital number, since it uses as much as digits as its factorization.

139433557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87638.

The product of its digits is 170100, while the sum is 40.

The square root of 139433557 is about 11808.1987195338. The cubic root of 139433557 is about 518.5481655026.

The spelling of 139433557 in words is "one hundred thirty-nine million, four hundred thirty-three thousand, five hundred fifty-seven".