199925805 has 32 divisors (see below), whose sum is σ = 327856896. Its totient is φ = 103993344.

The previous prime is 199925783. The next prime is 199925833. The reversal of 199925805 is 508529991.

It is a happy number.

199925805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199925805 - 2⁶ = 199925741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152784 + ... + 154086.

It is an arithmetic number, because the mean of its divisors is an integer number (10245528).

Almost surely, 2^199925805 is an apocalyptic number.

199925805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199925805 is a deficient number, since it is larger than the sum of its proper divisors (127931091).

199925805 is a wasteful number, since it uses less digits than its factorization.

199925805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557.

The product of its (nonzero) digits is 291600, while the sum is 48.

The square root of 199925805 is about 14139.5121910199. The cubic root of 199925805 is about 584.7312228662.

The spelling of 199925805 in words is "one hundred ninety-nine million, nine hundred twenty-five thousand, eight hundred five".