42668913 has 16 divisors (see below), whose sum is σ = 65598336. Its totient is φ = 24165120.

The previous prime is 42668891. The next prime is 42668917. The reversal of 42668913 is 31986624.

It is not a de Polignac number, because 42668913 - 2¹⁴ = 42652529 is a prime.

It is a super-2 number, since 2×42668913² = 3641272273203138, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42668917) 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, 6618 + ... + 11363.

It is an arithmetic number, because the mean of its divisors is an integer number (4099896).

Almost surely, 2^42668913 is an apocalyptic number.

It is an amenable number.

42668913 is a deficient number, since it is larger than the sum of its proper divisors (22929423).

42668913 is a wasteful number, since it uses less digits than its factorization.

42668913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18104.

The product of its digits is 62208, while the sum is 39.

The square root of 42668913 is about 6532.1445942355. The cubic root of 42668913 is about 349.4383181398.

The spelling of 42668913 in words is "forty-two million, six hundred sixty-eight thousand, nine hundred thirteen".