139203307 has 4 divisors (see below), whose sum is σ = 139648360. Its totient is φ = 138758256.

The previous prime is 139203301. The next prime is 139203343. The reversal of 139203307 is 703302931.

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

It is a cyclic number.

It is not a de Polignac number, because 139203307 - 2⁷ = 139203179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139203301) 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, 222057 + ... + 222682.

It is an arithmetic number, because the mean of its divisors is an integer number (34912090).

Almost surely, 2^139203307 is an apocalyptic number.

139203307 is a deficient number, since it is larger than the sum of its proper divisors (445053).

139203307 is an equidigital number, since it uses as much as digits as its factorization.

139203307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445052.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 139203307 is about 11798.4451094201. The cubic root of 139203307 is about 518.2625778760.

The spelling of 139203307 in words is "one hundred thirty-nine million, two hundred three thousand, three hundred seven".