194456640 has 224 divisors, whose sum is σ = 743224320. Its totient is φ = 42080256.

The previous prime is 194456627. The next prime is 194456641. The reversal of 194456640 is 46654491.

It is a tau number, because it is divible by the number of its divisors (224).

It is not an unprimeable number, because it can be changed into a prime (194456641) 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, 126919 + ... + 128441.

Almost surely, 2^194456640 is an apocalyptic number.

194456640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 194456640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371612160).

194456640 is an abundant number, since it is smaller than the sum of its proper divisors (548767680).

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

194456640 is a wasteful number, since it uses less digits than its factorization.

194456640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569 (or 1559 counting only the distinct ones).

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

The square root of 194456640 is about 13944.7710630186. The cubic root of 194456640 is about 579.3498859163.

The spelling of 194456640 in words is "one hundred ninety-four million, four hundred fifty-six thousand, six hundred forty".