397770240 has 320 divisors, whose sum is σ = 1492761600. Its totient is φ = 90316800.

The previous prime is 397770227. The next prime is 397770287. The reversal of 397770240 is 42077793.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2634165 + ... + 2634315.

It is an arithmetic number, because the mean of its divisors is an integer number (4664880).

Almost surely, 2^397770240 is an apocalyptic number.

397770240 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 397770240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746380800).

397770240 is an abundant number, since it is smaller than the sum of its proper divisors (1094991360).

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

397770240 is an equidigital number, since it uses as much as digits as its factorization.

397770240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 74088, while the sum is 39.

The square root of 397770240 is about 19944.1780978811. The cubic root of 397770240 is about 735.4346635334.

The spelling of 397770240 in words is "three hundred ninety-seven million, seven hundred seventy thousand, two hundred forty".