40643748 has 48 divisors (see below), whose sum is σ = 105840000. Its totient is φ = 13487904.

The previous prime is 40643747. The next prime is 40643749. The reversal of 40643748 is 84734604.

40643748 is a `hidden beast` number, since 4 + 0 + 643 + 7 + 4 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (40643747) and next prime (40643749).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (40643747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28353 + ... + 29751.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^40643748 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40643748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52920000).

40643748 is an abundant number, since it is smaller than the sum of its proper divisors (65196252).

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

40643748 is a wasteful number, since it uses less digits than its factorization.

40643748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 40643748 is about 6375.2449364711. The cubic root of 40643748 is about 343.8200902587.

The spelling of 40643748 in words is "forty million, six hundred forty-three thousand, seven hundred forty-eight".