31442042 has 4 divisors (see below), whose sum is σ = 47163066. Its totient is φ = 15721020.

The previous prime is 31441999. The next prime is 31442069. The reversal of 31442042 is 24024413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24024413 = 7 ⋅3432059.

It can be written as a sum of positive squares in only one way, i.e., 29365561 + 2076481 = 5419^2 + 1441^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860509 + ... + 7860512.

Almost surely, 2^31442042 is an apocalyptic number.

31442042 is a deficient number, since it is larger than the sum of its proper divisors (15721024).

31442042 is a wasteful number, since it uses less digits than its factorization.

31442042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15721023.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 31442042 is about 5607.3203939137. The cubic root of 31442042 is about 315.6241659554.

Adding to 31442042 its reverse (24024413), we get a palindrome (55466455).

The spelling of 31442042 in words is "thirty-one million, four hundred forty-two thousand, forty-two".