31220042394 has 128 divisors (see below), whose sum is σ = 73075737600. Its totient is φ = 8824273920.

The previous prime is 31220042383. The next prime is 31220042401. The reversal of 31220042394 is 49324002213.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3761389 + ... + 3769679.

It is an arithmetic number, because the mean of its divisors is an integer number (570904200).

Almost surely, 2^31220042394 is an apocalyptic number.

31220042394 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

31220042394 is an abundant number, since it is smaller than the sum of its proper divisors (41855695206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31220042394 is a wasteful number, since it uses less digits than its factorization.

31220042394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 31220042394 in words is "thirty-one billion, two hundred twenty million, forty-two thousand, three hundred ninety-four".