40388521 has 8 divisors (see below), whose sum is σ = 40832064. Its totient is φ = 39947760.

The previous prime is 40388519. The next prime is 40388599. The reversal of 40388521 is 12588304.

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 40388521 - 2¹ = 40388519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40388021) 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, 40596 + ... + 41578.

It is an arithmetic number, because the mean of its divisors is an integer number (5104008).

Almost surely, 2^40388521 is an apocalyptic number.

It is an amenable number.

40388521 is a deficient number, since it is larger than the sum of its proper divisors (443543).

40388521 is a wasteful number, since it uses less digits than its factorization.

40388521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 40388521 is about 6355.1963777684. The cubic root of 40388521 is about 343.0988928525.

The spelling of 40388521 in words is "forty million, three hundred eighty-eight thousand, five hundred twenty-one".