199400431 has 2 divisors, whose sum is σ = 199400432. Its totient is φ = 199400430.

The previous prime is 199400423. The next prime is 199400441. The reversal of 199400431 is 134004991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199400431 - 2³ = 199400423 is a prime.

It is a super-2 number, since 2×199400431² = 79521063765971522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199400393 and 199400402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199400441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99700215 + 99700216.

It is an arithmetic number, because the mean of its divisors is an integer number (99700216).

Almost surely, 2^199400431 is an apocalyptic number.

199400431 is a deficient number, since it is larger than the sum of its proper divisors (1).

199400431 is an equidigital number, since it uses as much as digits as its factorization.

199400431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 199400431 is about 14120.9217475348. The cubic root of 199400431 is about 584.2185792406.

The spelling of 199400431 in words is "one hundred ninety-nine million, four hundred thousand, four hundred thirty-one".