42279381 has 16 divisors (see below), whose sum is σ = 64657920. Its totient is φ = 27276480.

The previous prime is 42279373. The next prime is 42279383. The reversal of 42279381 is 18397224.

42279381 is a `hidden beast` number, since 4 + 2 + 279 + 381 = 666.

It is not a de Polignac number, because 42279381 - 2³ = 42279373 is a prime.

It is a super-2 number, since 2×42279381² = 3575092115486322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42279383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24420 + ... + 26093.

It is an arithmetic number, because the mean of its divisors is an integer number (4041120).

Almost surely, 2^42279381 is an apocalyptic number.

It is an amenable number.

42279381 is a deficient number, since it is larger than the sum of its proper divisors (22378539).

42279381 is a wasteful number, since it uses less digits than its factorization.

42279381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50553 (or 50547 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 42279381 is about 6502.2596841406. The cubic root of 42279381 is about 348.3717044997.

The spelling of 42279381 in words is "forty-two million, two hundred seventy-nine thousand, three hundred eighty-one".