199487890 has 32 divisors (see below), whose sum is σ = 411235200. Its totient is φ = 68252544.

The previous prime is 199487851. The next prime is 199487933. The reversal of 199487890 is 98784991.

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, 33886 + ... + 39334.

It is an arithmetic number, because the mean of its divisors is an integer number (12851100).

Almost surely, 2^199487890 is an apocalyptic number.

199487890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199487890 is an abundant number, since it is smaller than the sum of its proper divisors (211747310).

199487890 is a wasteful number, since it uses less digits than its factorization.

199487890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5986.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 199487890 is about 14124.0181959668. The cubic root of 199487890 is about 584.3039814369.

The spelling of 199487890 in words is "one hundred ninety-nine million, four hundred eighty-seven thousand, eight hundred ninety".