40045521 has 32 divisors (see below), whose sum is σ = 58798080. Its totient is φ = 24148800.

The previous prime is 40045517. The next prime is 40045547. The reversal of 40045521 is 12554004.

It is not a de Polignac number, because 40045521 - 2² = 40045517 is a prime.

It is a super-2 number, since 2×40045521² = 3207287504322882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40045501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231391 + ... + 231563.

It is an arithmetic number, because the mean of its divisors is an integer number (1837440).

Almost surely, 2^40045521 is an apocalyptic number.

It is an amenable number.

40045521 is a deficient number, since it is larger than the sum of its proper divisors (18752559).

40045521 is a wasteful number, since it uses less digits than its factorization.

40045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 40045521 is about 6328.1530480860. The cubic root of 40045521 is about 342.1248731784.

Adding to 40045521 its reverse (12554004), we get a palindrome (52599525).

The spelling of 40045521 in words is "forty million, forty-five thousand, five hundred twenty-one".