42279931 has 16 divisors (see below), whose sum is σ = 44697600. Its totient is φ = 39955968.

The previous prime is 42279929. The next prime is 42279949. The reversal of 42279931 is 13997224.

It is a cyclic number.

It is not a de Polignac number, because 42279931 - 2¹ = 42279929 is a prime.

It is a super-2 number, since 2×42279931² = 3575185130729522, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (27216) is a multiple of the sum of its prime divisors (378).

It is not an unprimeable number, because it can be changed into a prime (42279961) 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, 218971 + ... + 219163.

It is an arithmetic number, because the mean of its divisors is an integer number (2793600).

Almost surely, 2^42279931 is an apocalyptic number.

42279931 is a deficient number, since it is larger than the sum of its proper divisors (2417669).

42279931 is a wasteful number, since it uses less digits than its factorization.

42279931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 27216, while the sum is 37.

The square root of 42279931 is about 6502.3019769925. The cubic root of 42279931 is about 348.3732151147.

The spelling of 42279931 in words is "forty-two million, two hundred seventy-nine thousand, nine hundred thirty-one".