397749672 has 96 divisors (see below), whose sum is σ = 1131137280. Its totient is φ = 126023040.

The previous prime is 397749661. The next prime is 397749679. The reversal of 397749672 is 276947793.

It is a super-2 number, since 2×397749672² = 316409603152215168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397749679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299073 + ... + 300399.

It is an arithmetic number, because the mean of its divisors is an integer number (11782680).

Almost surely, 2^397749672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397749672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565568640).

397749672 is an abundant number, since it is smaller than the sum of its proper divisors (733387608).

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

397749672 is a wasteful number, since it uses less digits than its factorization.

397749672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1536 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 54.

The square root of 397749672 is about 19943.6624520172. The cubic root of 397749672 is about 735.4219873036.

The spelling of 397749672 in words is "three hundred ninety-seven million, seven hundred forty-nine thousand, six hundred seventy-two".