1994400186 has 16 divisors (see below), whose sum is σ = 4223435904. Its totient is φ = 625694144.

The previous prime is 1994400181. The next prime is 1994400251. The reversal of 1994400186 is 6810044991.

It is not an unprimeable number, because it can be changed into a prime (1994400181) 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, 9776370 + ... + 9776573.

It is an arithmetic number, because the mean of its divisors is an integer number (263964744).

Almost surely, 2^1994400186 is an apocalyptic number.

1994400186 is an abundant number, since it is smaller than the sum of its proper divisors (2229035718).

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

1994400186 is a wasteful number, since it uses less digits than its factorization.

1994400186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19552965.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 1994400186 is about 44658.7078406888. The cubic root of 1994400186 is about 1258.7440634706.

The spelling of 1994400186 in words is "one billion, nine hundred ninety-four million, four hundred thousand, one hundred eighty-six".