199445840 has 40 divisors (see below), whose sum is σ = 505869408. Its totient is φ = 72525440.

The previous prime is 199445839. The next prime is 199445843. The reversal of 199445840 is 48544991.

199445840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 199445791 and 199445800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199445843) 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, 112442 + ... + 114201.

Almost surely, 2^199445840 is an apocalyptic number.

199445840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199445840 is an abundant number, since it is smaller than the sum of its proper divisors (306423568).

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

199445840 is a wasteful number, since it uses less digits than its factorization.

199445840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226667 (or 226661 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 199445840 is about 14122.5295184680. The cubic root of 199445840 is about 584.2629234576.

The spelling of 199445840 in words is "one hundred ninety-nine million, four hundred forty-five thousand, eight hundred forty".