40021787 has 8 divisors (see below), whose sum is σ = 43585920. Its totient is φ = 36527040.

The previous prime is 40021763. The next prime is 40021789. The reversal of 40021787 is 78712004.

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 40021787 - 2¹⁰ = 40020763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021789) 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, 16139 + ... + 18452.

It is an arithmetic number, because the mean of its divisors is an integer number (5448240).

Almost surely, 2^40021787 is an apocalyptic number.

40021787 is a deficient number, since it is larger than the sum of its proper divisors (3564133).

40021787 is a wasteful number, since it uses less digits than its factorization.

40021787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34693.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 40021787 is about 6326.2774994463. The cubic root of 40021787 is about 342.0572701420.

The spelling of 40021787 in words is "forty million, twenty-one thousand, seven hundred eighty-seven".