199925426 has 8 divisors (see below), whose sum is σ = 304804524. Its totient is φ = 98323920.

The previous prime is 199925413. The next prime is 199925437. The reversal of 199925426 is 624529991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 198105625 + 1819801 = 14075^2 + 1349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×199925426² = 79940351922562952, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819245 + ... + 819488.

Almost surely, 2^199925426 is an apocalyptic number.

199925426 is a deficient number, since it is larger than the sum of its proper divisors (104879098).

199925426 is a wasteful number, since it uses less digits than its factorization.

199925426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638796.

The product of its digits is 349920, while the sum is 47.

The square root of 199925426 is about 14139.4987888539. The cubic root of 199925426 is about 584.7308533737.

The spelling of 199925426 in words is "one hundred ninety-nine million, nine hundred twenty-five thousand, four hundred twenty-six".