2157668239 has 8 divisors (see below), whose sum is σ = 2171121680. Its totient is φ = 2144232000.

The previous prime is 2157668197. The next prime is 2157668243. The reversal of 2157668239 is 9328667512.

2157668239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157668239 - 2²¹ = 2155571087 is a prime.

It is a super-2 number, since 2×2157668239² = 9311064459178722242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2157668192 and 2157668201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157668039) 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, 322672 + ... + 329290.

It is an arithmetic number, because the mean of its divisors is an integer number (271390210).

Almost surely, 2^2157668239 is an apocalyptic number.

2157668239 is a deficient number, since it is larger than the sum of its proper divisors (13453441).

2157668239 is a wasteful number, since it uses less digits than its factorization.

2157668239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8601.

The product of its digits is 1088640, while the sum is 49.

The square root of 2157668239 is about 46450.7076264722. The cubic root of 2157668239 is about 1292.1954959106.

The spelling of 2157668239 in words is "two billion, one hundred fifty-seven million, six hundred sixty-eight thousand, two hundred thirty-nine".