40169521 has 16 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 31357440.

The previous prime is 40169497. The next prime is 40169567. The reversal of 40169521 is 12596104.

It is a cyclic number.

It is not a de Polignac number, because 40169521 - 2¹¹ = 40167473 is a prime.

It is a super-2 number, since 2×40169521² = 3227180834738882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40169521.

It is not an unprimeable number, because it can be changed into a prime (40169581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (3136320).

Almost surely, 2^40169521 is an apocalyptic number.

It is an amenable number.

40169521 is a deficient number, since it is larger than the sum of its proper divisors (10011599).

40169521 is a wasteful number, since it uses less digits than its factorization.

40169521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10944.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 40169521 is about 6337.9429628232. The cubic root of 40169521 is about 342.4776364889.

The spelling of 40169521 in words is "forty million, one hundred sixty-nine thousand, five hundred twenty-one".