40188749 has 8 divisors (see below), whose sum is σ = 40742520. Its totient is φ = 39638016.

The previous prime is 40188739. The next prime is 40188773. The reversal of 40188749 is 94788104.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2280100 + 37908649 = 1510^2 + 6157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40188749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40188739) 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, 39167 + ... + 40179.

It is an arithmetic number, because the mean of its divisors is an integer number (5092815).

Almost surely, 2^40188749 is an apocalyptic number.

It is an amenable number.

40188749 is a deficient number, since it is larger than the sum of its proper divisors (553771).

40188749 is a wasteful number, since it uses less digits than its factorization.

40188749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 40188749 is about 6339.4596772911. The cubic root of 40188749 is about 342.5322725197.

The spelling of 40188749 in words is "forty million, one hundred eighty-eight thousand, seven hundred forty-nine".