40351521 has 16 divisors (see below), whose sum is σ = 62797824. Its totient is φ = 22566864.

The previous prime is 40351517. The next prime is 40351547. The reversal of 40351521 is 12515304.

It is not a de Polignac number, because 40351521 - 2² = 40351517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40351511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19455 + ... + 21428.

It is an arithmetic number, because the mean of its divisors is an integer number (3924864).

Almost surely, 2^40351521 is an apocalyptic number.

It is an amenable number.

40351521 is a deficient number, since it is larger than the sum of its proper divisors (22446303).

40351521 is a wasteful number, since it uses less digits than its factorization.

40351521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40940.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 40351521 is about 6352.2847070956. The cubic root of 40351521 is about 342.9940896623.

Adding to 40351521 its reverse (12515304), we get a palindrome (52866825).

The spelling of 40351521 in words is "forty million, three hundred fifty-one thousand, five hundred twenty-one".