393997213740 has 576 divisors, whose sum is σ = 1330501939200. Its totient is φ = 86693068800.

The previous prime is 393997213723. The next prime is 393997213793. The reversal of 393997213740 is 47312799393.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 244870056 + ... + 244871664.

It is an arithmetic number, because the mean of its divisors is an integer number (2309899200).

Almost surely, 2^393997213740 is an apocalyptic number.

393997213740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 393997213740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665250969600).

393997213740 is an abundant number, since it is smaller than the sum of its proper divisors (936504725460).

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

393997213740 is a wasteful number, since it uses less digits than its factorization.

393997213740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 7715736, while the sum is 57.

The spelling of 393997213740 in words is "three hundred ninety-three billion, nine hundred ninety-seven million, two hundred thirteen thousand, seven hundred forty".