31440074 has 4 divisors (see below), whose sum is σ = 47160114. Its totient is φ = 15720036.

The previous prime is 31440067. The next prime is 31440083. The reversal of 31440074 is 47004413.

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

It can be written as a sum of positive squares in only one way, i.e., 30327049 + 1113025 = 5507^2 + 1055^2 .

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 as a sum of consecutive naturals, namely, 7860017 + ... + 7860020.

Almost surely, 2^31440074 is an apocalyptic number.

31440074 is a deficient number, since it is larger than the sum of its proper divisors (15720040).

31440074 is a wasteful number, since it uses less digits than its factorization.

31440074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15720039.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31440074 is about 5607.1449062781. The cubic root of 31440074 is about 315.6175807033.

Adding to 31440074 its reverse (47004413), we get a palindrome (78444487).

The spelling of 31440074 in words is "thirty-one million, four hundred forty thousand, seventy-four".