199400437 has 8 divisors (see below), whose sum is σ = 204975800. Its totient is φ = 193834944.

The previous prime is 199400431. The next prime is 199400441. The reversal of 199400437 is 734004991.

It can be written as a sum of positive squares in 4 ways, for example, as 51753636 + 147646801 = 7194^2 + 12151^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 199400437 - 2¹⁵ = 199367669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199400396 and 199400405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199400431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60139 + ... + 63367.

It is an arithmetic number, because the mean of its divisors is an integer number (25621975).

Almost surely, 2^199400437 is an apocalyptic number.

It is an amenable number.

199400437 is a deficient number, since it is larger than the sum of its proper divisors (5575363).

199400437 is a wasteful number, since it uses less digits than its factorization.

199400437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 199400437 is about 14120.9219599855. The cubic root of 199400437 is about 584.2185851004.

The spelling of 199400437 in words is "one hundred ninety-nine million, four hundred thousand, four hundred thirty-seven".