42240381 has 4 divisors (see below), whose sum is σ = 56320512. Its totient is φ = 28160252.

The previous prime is 42240361. The next prime is 42240389. The reversal of 42240381 is 18304224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42240381 - 2⁵ = 42240349 is a prime.

It is a super-2 number, since 2×42240381² = 3568499574050322, 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 (42240389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7040061 + ... + 7040066.

It is an arithmetic number, because the mean of its divisors is an integer number (14080128).

Almost surely, 2^42240381 is an apocalyptic number.

It is an amenable number.

42240381 is a deficient number, since it is larger than the sum of its proper divisors (14080131).

42240381 is a wasteful number, since it uses less digits than its factorization.

42240381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14080130.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 42240381 is about 6499.2600348040. The cubic root of 42240381 is about 348.2645547429.

The spelling of 42240381 in words is "forty-two million, two hundred forty thousand, three hundred eighty-one".