397889280 has 288 divisors, whose sum is σ = 1464321600. Its totient is φ = 102187008.

The previous prime is 397889273. The next prime is 397889291. The reversal of 397889280 is 82988793.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1002042 + ... + 1002438.

It is an arithmetic number, because the mean of its divisors is an integer number (5084450).

Almost surely, 2^397889280 is an apocalyptic number.

397889280 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 397889280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732160800).

397889280 is an abundant number, since it is smaller than the sum of its proper divisors (1066432320).

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

397889280 is a wasteful number, since it uses less digits than its factorization.

397889280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 397889280 is about 19947.1622041833. The cubic root of 397889280 is about 735.5080202954.

The spelling of 397889280 in words is "three hundred ninety-seven million, eight hundred eighty-nine thousand, two hundred eighty".