393497970 has 64 divisors (see below), whose sum is σ = 966898944. Its totient is φ = 102452480.

The previous prime is 393497947. The next prime is 393497977. The reversal of 393497970 is 79794393.

It is not an unprimeable number, because it can be changed into a prime (393497977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 417700 + ... + 418640.

It is an arithmetic number, because the mean of its divisors is an integer number (15107796).

Almost surely, 2^393497970 is an apocalyptic number.

393497970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 393497970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483449472).

393497970 is an abundant number, since it is smaller than the sum of its proper divisors (573400974).

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

393497970 is a wasteful number, since it uses less digits than its factorization.

393497970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267.

The product of its (nonzero) digits is 1285956, while the sum is 51.

The square root of 393497970 is about 19836.7832573732. The cubic root of 393497970 is about 732.7921900785.

The spelling of 393497970 in words is "three hundred ninety-three million, four hundred ninety-seven thousand, nine hundred seventy".