139450871 has 4 divisors (see below), whose sum is σ = 159372432. Its totient is φ = 119529312.

The previous prime is 139450859. The next prime is 139450889. The reversal of 139450871 is 178054931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178054931 = 53 ⋅3359527.

It is not a de Polignac number, because 139450871 - 2²² = 135256567 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 (139450811) 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, 9960770 + ... + 9960783.

It is an arithmetic number, because the mean of its divisors is an integer number (39843108).

Almost surely, 2^139450871 is an apocalyptic number.

139450871 is a deficient number, since it is larger than the sum of its proper divisors (19921561).

139450871 is an equidigital number, since it uses as much as digits as its factorization.

139450871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19921560.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 139450871 is about 11808.9318314571. The cubic root of 139450871 is about 518.5696279863.

The spelling of 139450871 in words is "one hundred thirty-nine million, four hundred fifty thousand, eight hundred seventy-one".