40194720 has 144 divisors (see below), whose sum is σ = 139007232. Its totient is φ = 10575360.

The previous prime is 40194689. The next prime is 40194727. The reversal of 40194720 is 2749104.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (40194727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148185 + ... + 148455.

It is an arithmetic number, because the mean of its divisors is an integer number (965328).

Almost surely, 2^40194720 is an apocalyptic number.

40194720 is a gapful number since it is divisible by the number (40) 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 40194720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69503616).

40194720 is an abundant number, since it is smaller than the sum of its proper divisors (98812512).

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

40194720 is a wasteful number, since it uses less digits than its factorization.

40194720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 40194720 is about 6339.9305989892. The cubic root of 40194720 is about 342.5492354672.

The spelling of 40194720 in words is "forty million, one hundred ninety-four thousand, seven hundred twenty".