139406503 has 8 divisors (see below), whose sum is σ = 140833280. Its totient is φ = 137985120.

The previous prime is 139406497. The next prime is 139406513. The reversal of 139406503 is 305604931.

139406503 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 a cyclic number.

It is not a de Polignac number, because 139406503 - 2⁵ = 139406471 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 (139406513) 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, 67693 + ... + 69721.

It is an arithmetic number, because the mean of its divisors is an integer number (17604160).

Almost surely, 2^139406503 is an apocalyptic number.

139406503 is a deficient number, since it is larger than the sum of its proper divisors (1426777).

139406503 is a wasteful number, since it uses less digits than its factorization.

139406503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 139406503 is about 11807.0531039714. The cubic root of 139406503 is about 518.5146257297.

The spelling of 139406503 in words is "one hundred thirty-nine million, four hundred six thousand, five hundred three".