397663830 has 80 divisors (see below), whose sum is σ = 1132211520. Its totient is φ = 99802368.

The previous prime is 397663817. The next prime is 397663853. The reversal of 397663830 is 38366793.

It is a happy number.

397663830 is a `hidden beast` number, since 3 + 9 + 7 + 6 + 638 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 670 + ... + 28209.

It is an arithmetic number, because the mean of its divisors is an integer number (14152644).

Almost surely, 2^397663830 is an apocalyptic number.

397663830 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 397663830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (566105760).

397663830 is an abundant number, since it is smaller than the sum of its proper divisors (734547690).

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

397663830 is a wasteful number, since it uses less digits than its factorization.

397663830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28915 (or 28906 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 397663830 is about 19941.5102236516. The cubic root of 397663830 is about 735.3690774453.

The spelling of 397663830 in words is "three hundred ninety-seven million, six hundred sixty-three thousand, eight hundred thirty".