199401858 has 64 divisors (see below), whose sum is σ = 477388800. Its totient is φ = 61514640.

The previous prime is 199401817. The next prime is 199401859. The reversal of 199401858 is 858104991.

199401858 is a `hidden beast` number, since 199 + 401 + 8 + 58 = 666.

It is a super-2 number, since 2×199401858² = 79522201947704328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199401859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35913 + ... + 41091.

It is an arithmetic number, because the mean of its divisors is an integer number (7459200).

Almost surely, 2^199401858 is an apocalyptic number.

199401858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199401858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238694400).

199401858 is an abundant number, since it is smaller than the sum of its proper divisors (277986942).

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

199401858 is a wasteful number, since it uses less digits than its factorization.

199401858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244 (or 5238 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 199401858 is about 14120.9722753074. The cubic root of 199401858 is about 584.2199728817.

The spelling of 199401858 in words is "one hundred ninety-nine million, four hundred one thousand, eight hundred fifty-eight".