197809404 has 48 divisors (see below), whose sum is σ = 499000320. Its totient is φ = 60626880.

The previous prime is 197809369. The next prime is 197809439. The reversal of 197809404 is 404908791.

It is an interprime number because it is at equal distance from previous prime (197809369) and next prime (197809439).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39937 + ... + 44615.

It is an arithmetic number, because the mean of its divisors is an integer number (10395840).

Almost surely, 2^197809404 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 197809404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249500160).

197809404 is an abundant number, since it is smaller than the sum of its proper divisors (301190916).

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

197809404 is a wasteful number, since it uses less digits than its factorization.

197809404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970 (or 4968 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 197809404 is about 14064.4731149091. The cubic root of 197809404 is about 582.6605907190.

The spelling of 197809404 in words is "one hundred ninety-seven million, eight hundred nine thousand, four hundred four".