393777123842 has 8 divisors (see below), whose sum is σ = 625410726156. Its totient is φ = 185306881792.

The previous prime is 393777123829. The next prime is 393777123847. The reversal of 393777123842 is 248321777393.

It can be written as a sum of positive squares in 2 ways, for example, as 384426040441 + 9351083401 = 620021^2 + 96701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×393777123842² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (393777123847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5790840023 + ... + 5790840090.

Almost surely, 2^393777123842 is an apocalyptic number.

393777123842 is a deficient number, since it is larger than the sum of its proper divisors (231633602314).

393777123842 is a wasteful number, since it uses less digits than its factorization.

393777123842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11581680132.

The product of its digits is 10668672, while the sum is 56.

The spelling of 393777123842 in words is "three hundred ninety-three billion, seven hundred seventy-seven million, one hundred twenty-three thousand, eight hundred forty-two".