199403904 has 128 divisors (see below), whose sum is σ = 625121280. Its totient is φ = 55111680.

The previous prime is 199403887. The next prime is 199403923. The reversal of 199403904 is 409304991.

It is a tau number, because it is divible by the number of its divisors (128).

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, 82132 + ... + 84524.

It is an arithmetic number, because the mean of its divisors is an integer number (4883760).

Almost surely, 2^199403904 is an apocalyptic number.

199403904 is a gapful number since it is divisible by the number (14) 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 199403904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312560640).

199403904 is an abundant number, since it is smaller than the sum of its proper divisors (425717376).

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

199403904 is a wasteful number, since it uses less digits than its factorization.

199403904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448 (or 2436 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 199403904 is about 14121.0447205580. The cubic root of 199403904 is about 584.2219710409.

The spelling of 199403904 in words is "one hundred ninety-nine million, four hundred three thousand, nine hundred four".