139287927 has 4 divisors (see below), whose sum is σ = 185717240. Its totient is φ = 92858616.

The previous prime is 139287913. The next prime is 139287983. The reversal of 139287927 is 729782931.

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

It is not a de Polignac number, because 139287927 - 2⁸ = 139287671 is a prime.

It is a super-2 number, since 2×139287927² = 38802253215914658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139287997) 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, 23214652 + ... + 23214657.

It is an arithmetic number, because the mean of its divisors is an integer number (46429310).

Almost surely, 2^139287927 is an apocalyptic number.

139287927 is a deficient number, since it is larger than the sum of its proper divisors (46429313).

139287927 is an equidigital number, since it uses as much as digits as its factorization.

139287927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46429312.

The product of its digits is 381024, while the sum is 48.

The square root of 139287927 is about 11802.0306303619. The cubic root of 139287927 is about 518.3675717801.

The spelling of 139287927 in words is "one hundred thirty-nine million, two hundred eighty-seven thousand, nine hundred twenty-seven".