199640842 has 8 divisors (see below), whose sum is σ = 302426532. Its totient is φ = 98832000.

The previous prime is 199640827. The next prime is 199640867. The reversal of 199640842 is 248046991.

199640842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 177182721 + 22458121 = 13311^2 + 4739^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493959 + ... + 494362.

Almost surely, 2^199640842 is an apocalyptic number.

199640842 is a deficient number, since it is larger than the sum of its proper divisors (102785690).

199640842 is a wasteful number, since it uses less digits than its factorization.

199640842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988424.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 199640842 is about 14129.4317649366. The cubic root of 199640842 is about 584.4532764334.

The spelling of 199640842 in words is "one hundred ninety-nine million, six hundred forty thousand, eight hundred forty-two".