31404412786 has 4 divisors (see below), whose sum is σ = 47106619182. Its totient is φ = 15702206392.

The previous prime is 31404412771. The next prime is 31404412883. The reversal of 31404412786 is 68721440413.

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., 18481043025 + 12923369761 = 135945^2 + 113681^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7851103195 + ... + 7851103198.

Almost surely, 2^31404412786 is an apocalyptic number.

31404412786 is a deficient number, since it is larger than the sum of its proper divisors (15702206396).

31404412786 is a wasteful number, since it uses less digits than its factorization.

31404412786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15702206395.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 31404412786 in words is "thirty-one billion, four hundred four million, four hundred twelve thousand, seven hundred eighty-six".