397968750 has 96 divisors (see below), whose sum is σ = 1081637856. Its totient is φ = 105750000.

The previous prime is 397968749. The next prime is 397968763. The reversal of 397968750 is 57869793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1406109 + ... + 1406391.

It is an arithmetic number, because the mean of its divisors is an integer number (11267061).

Almost surely, 2^397968750 is an apocalyptic number.

397968750 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 397968750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540818928).

397968750 is an abundant number, since it is smaller than the sum of its proper divisors (683669106).

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

397968750 is an frugal number, since it uses more digits than its factorization.

397968750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 397968750 is about 19949.1541174056. The cubic root of 397968750 is about 735.5569844456.

The spelling of 397968750 in words is "three hundred ninety-seven million, nine hundred sixty-eight thousand, seven hundred fifty".