239681457 has 8 divisors (see below), whose sum is σ = 355083680. Its totient is φ = 159787620.

The previous prime is 239681443. The next prime is 239681503. The reversal of 239681457 is 754186932.

It is not a de Polignac number, because 239681457 - 2⁷ = 239681329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239681857) 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, 4438519 + ... + 4438572.

It is an arithmetic number, because the mean of its divisors is an integer number (44385460).

Almost surely, 2^239681457 is an apocalyptic number.

239681457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

239681457 is a deficient number, since it is larger than the sum of its proper divisors (115402223).

239681457 is an equidigital number, since it uses as much as digits as its factorization.

239681457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8877100 (or 8877094 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 239681457 is about 15481.6490400732. The cubic root of 239681457 is about 621.1714385825.

It can be divided in two parts, 23968 and 1457, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 239681457 in words is "two hundred thirty-nine million, six hundred eighty-one thousand, four hundred fifty-seven".