40643387 has 8 divisors (see below), whose sum is σ = 42040320. Its totient is φ = 39251880.

The previous prime is 40643381. The next prime is 40643399. The reversal of 40643387 is 78334604.

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

It is a cyclic number.

It is not a de Polignac number, because 40643387 - 2⁴ = 40643371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40643381) 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, 18914 + ... + 20952.

It is an arithmetic number, because the mean of its divisors is an integer number (5255040).

Almost surely, 2^40643387 is an apocalyptic number.

40643387 is a deficient number, since it is larger than the sum of its proper divisors (1396933).

40643387 is a wasteful number, since it uses less digits than its factorization.

40643387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 40643387 is about 6375.2166237705. The cubic root of 40643387 is about 343.8190723127.

The spelling of 40643387 in words is "forty million, six hundred forty-three thousand, three hundred eighty-seven".