199402440050 has 54 divisors (see below), whose sum is σ = 407741895687. Its totient is φ = 72497348000.

The previous prime is 199402440047. The next prime is 199402440053. The reversal of 199402440050 is 50044204991.

It is an interprime number because it is at equal distance from previous prime (199402440047) and next prime (199402440053).

It can be written as a sum of positive squares in 5 ways, for example, as 71761301689 + 127641138361 = 267883^2 + 357269^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=315755.

It is a super-2 number, since 2×199402440050² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199402439986 and 199402440013.

It is not an unprimeable number, because it can be changed into a prime (199402440053) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 34730180 + ... + 34735920.

Almost surely, 2^199402440050 is an apocalyptic number.

199402440050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199402440050 is an abundant number, since it is smaller than the sum of its proper divisors (208339455637).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199402440050 is an frugal number, since it uses more digits than its factorization.

199402440050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11516 (or 5759 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 199402440050 in words is "one hundred ninety-nine billion, four hundred two million, four hundred forty thousand, fifty".