197990400 has 144 divisors (see below), whose sum is σ = 655036200. Its totient is φ = 52756480.

The previous prime is 197990399. The next prime is 197990407. The reversal of 197990400 is 4099791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197990407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152956 + ... + 154244.

Almost surely, 2^197990400 is an apocalyptic number.

197990400 is a gapful number since it is divisible by the number (10) 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 197990400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327518100).

197990400 is an abundant number, since it is smaller than the sum of its proper divisors (457045800).

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

197990400 is a wasteful number, since it uses less digits than its factorization.

197990400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1299 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 197990400 is about 14070.9061541892. The cubic root of 197990400 is about 582.8382484126.

The spelling of 197990400 in words is "one hundred ninety-seven million, nine hundred ninety thousand, four hundred".