197820400 has 60 divisors (see below), whose sum is σ = 500296600. Its totient is φ = 74960640.

The previous prime is 197820391. The next prime is 197820431. The reversal of 197820400 is 4028791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5415 + ... + 20614.

Almost surely, 2^197820400 is an apocalyptic number.

197820400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197820400 is an abundant number, since it is smaller than the sum of its proper divisors (302476200).

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

197820400 is a wasteful number, since it uses less digits than its factorization.

197820400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26066 (or 26055 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 197820400 is about 14064.8640235162. The cubic root of 197820400 is about 582.6713869990.

The spelling of 197820400 in words is "one hundred ninety-seven million, eight hundred twenty thousand, four hundred".