139685451 has 8 divisors (see below), whose sum is σ = 186306624. Its totient is φ = 93093960.

The previous prime is 139685449. The next prime is 139685459. The reversal of 139685451 is 154586931.

139685451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139685451 - 2¹ = 139685449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139685459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8356 + ... + 18686.

It is an arithmetic number, because the mean of its divisors is an integer number (23288328).

Almost surely, 2^139685451 is an apocalyptic number.

139685451 is a deficient number, since it is larger than the sum of its proper divisors (46621173).

139685451 is a wasteful number, since it uses less digits than its factorization.

139685451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14841.

The product of its digits is 129600, while the sum is 42.

The square root of 139685451 is about 11818.8599704032. The cubic root of 139685451 is about 518.8602390963.

The spelling of 139685451 in words is "one hundred thirty-nine million, six hundred eighty-five thousand, four hundred fifty-one".