397877784 has 128 divisors (see below), whose sum is σ = 1083974400. Its totient is φ = 121305600.

The previous prime is 397877783. The next prime is 397877789. The reversal of 397877784 is 487778793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397877783) 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, 2440887 + ... + 2441049.

It is an arithmetic number, because the mean of its divisors is an integer number (8468550).

Almost surely, 2^397877784 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 397877784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (541987200).

397877784 is an abundant number, since it is smaller than the sum of its proper divisors (686096616).

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

397877784 is a wasteful number, since it uses less digits than its factorization.

397877784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 341 counting only the distinct ones).

The product of its digits is 16595712, while the sum is 60.

The square root of 397877784 is about 19946.8740408115. The cubic root of 397877784 is about 735.5009366819.

The spelling of 397877784 in words is "three hundred ninety-seven million, eight hundred seventy-seven thousand, seven hundred eighty-four".