139457389 has 4 divisors (see below), whose sum is σ = 139481056. Its totient is φ = 139433724.

The previous prime is 139457387. The next prime is 139457411. The reversal of 139457389 is 983754931.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 983754931 = 313 ⋅3142987.

It is a cyclic number.

It is not a de Polignac number, because 139457389 - 2¹ = 139457387 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 (139457387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4792 + ... + 17374.

It is an arithmetic number, because the mean of its divisors is an integer number (34870264).

Almost surely, 2^139457389 is an apocalyptic number.

It is an amenable number.

139457389 is a deficient number, since it is larger than the sum of its proper divisors (23667).

139457389 is a wasteful number, since it uses less digits than its factorization.

139457389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23666.

The product of its digits is 816480, while the sum is 49.

The square root of 139457389 is about 11809.2078057760. The cubic root of 139457389 is about 518.5777072574.

The spelling of 139457389 in words is "one hundred thirty-nine million, four hundred fifty-seven thousand, three hundred eighty-nine".