40372521 has 24 divisors (see below), whose sum is σ = 65346624. Its totient is φ = 22065120.

The previous prime is 40372499. The next prime is 40372531. The reversal of 40372521 is 12527304.

It is not a de Polignac number, because 40372521 - 2⁵ = 40372489 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40372491 and 40372500.

It is not an unprimeable number, because it can be changed into a prime (40372531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2590 + ... + 9351.

It is an arithmetic number, because the mean of its divisors is an integer number (2722776).

Almost surely, 2^40372521 is an apocalyptic number.

It is an amenable number.

40372521 is a deficient number, since it is larger than the sum of its proper divisors (24974103).

40372521 is a wasteful number, since it uses less digits than its factorization.

40372521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11981 (or 11974 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 40372521 is about 6353.9374406741. The cubic root of 40372521 is about 343.0535804122.

Adding to 40372521 its reverse (12527304), we get a palindrome (52899825).

The spelling of 40372521 in words is "forty million, three hundred seventy-two thousand, five hundred twenty-one".