393940391474 has 12 divisors (see below), whose sum is σ = 687385785294. Its totient is φ = 168831596304.

The previous prime is 393940391363. The next prime is 393940391483. The reversal of 393940391474 is 474193049393.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 345785161225 + 48155230249 = 588035^2 + 219443^2 .

It is a super-3 number, since 3×393940391474³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2009899859 + ... + 2009900054.

Almost surely, 2^393940391474 is an apocalyptic number.

393940391474 is a deficient number, since it is larger than the sum of its proper divisors (293445393820).

393940391474 is a wasteful number, since it uses less digits than its factorization.

393940391474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019799929 (or 4019799922 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 56.

The spelling of 393940391474 in words is "three hundred ninety-three billion, nine hundred forty million, three hundred ninety-one thousand, four hundred seventy-four".