42402331 has 4 divisors (see below), whose sum is σ = 42662632. Its totient is φ = 42142032.

The previous prime is 42402307. The next prime is 42402377. The reversal of 42402331 is 13320424.

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 42402331 - 2⁵ = 42402299 is a prime.

It is a super-2 number, since 2×42402331² = 3595915348467122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42402299 and 42402308.

It is not an unprimeable number, because it can be changed into a prime (42402431) 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, 129906 + ... + 130231.

It is an arithmetic number, because the mean of its divisors is an integer number (10665658).

Almost surely, 2^42402331 is an apocalyptic number.

42402331 is a deficient number, since it is larger than the sum of its proper divisors (260301).

42402331 is a wasteful number, since it uses less digits than its factorization.

42402331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260300.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42402331 is about 6511.7072262196. The cubic root of 42402331 is about 348.7090702770.

Adding to 42402331 its reverse (13320424), we get a palindrome (55722755).

The spelling of 42402331 in words is "forty-two million, four hundred two thousand, three hundred thirty-one".