42400331 has 4 divisors (see below), whose sum is σ = 42491592. Its totient is φ = 42309072.

The previous prime is 42400321. The next prime is 42400357. The reversal of 42400331 is 13300424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42400331 - 2¹⁰ = 42399307 is a prime.

It is a super-2 number, since 2×42400331² = 3595576137819122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42400321) 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, 44930 + ... + 45863.

It is an arithmetic number, because the mean of its divisors is an integer number (10622898).

Almost surely, 2^42400331 is an apocalyptic number.

42400331 is a deficient number, since it is larger than the sum of its proper divisors (91261).

42400331 is an equidigital number, since it uses as much as digits as its factorization.

42400331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91260.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 42400331 is about 6511.5536548507. The cubic root of 42400331 is about 348.7035876452.

Adding to 42400331 its reverse (13300424), we get a palindrome (55700755).

The spelling of 42400331 in words is "forty-two million, four hundred thousand, three hundred thirty-one".