439661391 has 16 divisors (see below), whose sum is σ = 632088576. Its totient is φ = 270226656.

The previous prime is 439661381. The next prime is 439661393. The reversal of 439661391 is 193166934.

It is not a de Polignac number, because 439661391 - 2¹⁷ = 439530319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439661393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27126 + ... + 40188.

It is an arithmetic number, because the mean of its divisors is an integer number (39505536).

Almost surely, 2^439661391 is an apocalyptic number.

439661391 is a deficient number, since it is larger than the sum of its proper divisors (192427185).

439661391 is a wasteful number, since it uses less digits than its factorization.

439661391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13942.

The product of its digits is 104976, while the sum is 42.

The square root of 439661391 is about 20968.1041346136. The cubic root of 439661391 is about 760.3953339102.

The spelling of 439661391 in words is "four hundred thirty-nine million, six hundred sixty-one thousand, three hundred ninety-one".