31490042 has 16 divisors (see below), whose sum is σ = 47881152. Its totient is φ = 15531360.

The previous prime is 31490023. The next prime is 31490057. The reversal of 31490042 is 24009413.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68678 + ... + 69134.

It is an arithmetic number, because the mean of its divisors is an integer number (2992572).

Almost surely, 2^31490042 is an apocalyptic number.

31490042 is a deficient number, since it is larger than the sum of its proper divisors (16391110).

31490042 is a wasteful number, since it uses less digits than its factorization.

31490042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31490042 is about 5611.5988808895. The cubic root of 31490042 is about 315.7846968468.

Adding to 31490042 its reverse (24009413), we get a palindrome (55499455).

The spelling of 31490042 in words is "thirty-one million, four hundred ninety thousand, forty-two".