397421100 has 288 divisors, whose sum is σ = 1377689600. Its totient is φ = 97977600.

The previous prime is 397421069. The next prime is 397421177. The reversal of 397421100 is 1124793.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3129237 + ... + 3129363.

Almost surely, 2^397421100 is an apocalyptic number.

397421100 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 397421100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688844800).

397421100 is an abundant number, since it is smaller than the sum of its proper divisors (980268500).

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

397421100 is a wasteful number, since it uses less digits than its factorization.

397421100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 397421100 is about 19935.4232460713. The cubic root of 397421100 is about 735.2194263645.

Adding to 397421100 its reverse (1124793), we get a palindrome (398545893).

The spelling of 397421100 in words is "three hundred ninety-seven million, four hundred twenty-one thousand, one hundred".