194465640 has 32 divisors (see below), whose sum is σ = 583397280. Its totient is φ = 51857472.

The previous prime is 194465629. The next prime is 194465641. The reversal of 194465640 is 46564491.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (194465641) 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, 810154 + ... + 810393.

It is an arithmetic number, because the mean of its divisors is an integer number (18231165).

Almost surely, 2^194465640 is an apocalyptic number.

194465640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194465640 is an abundant number, since it is smaller than the sum of its proper divisors (388931640).

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

194465640 is a wasteful number, since it uses less digits than its factorization.

194465640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620561 (or 1620557 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 194465640 is about 13945.0937608895. The cubic root of 194465640 is about 579.3588237589.

The spelling of 194465640 in words is "one hundred ninety-four million, four hundred sixty-five thousand, six hundred forty".