40400521 has 16 divisors (see below), whose sum is σ = 47872000. Its totient is φ = 33375888.

The previous prime is 40400519. The next prime is 40400527. The reversal of 40400521 is 12500404.

It is not a de Polignac number, because 40400521 - 2¹ = 40400519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40400495 and 40400504.

It is not an unprimeable number, because it can be changed into a prime (40400527) 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, 22930 + ... + 24628.

It is an arithmetic number, because the mean of its divisors is an integer number (2992000).

Almost surely, 2^40400521 is an apocalyptic number.

It is an amenable number.

40400521 is a deficient number, since it is larger than the sum of its proper divisors (7471479).

40400521 is a wasteful number, since it uses less digits than its factorization.

40400521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40400521 is about 6356.1404169512. The cubic root of 40400521 is about 343.1328693300.

Adding to 40400521 its reverse (12500404), we get a palindrome (52900925).

The spelling of 40400521 in words is "forty million, four hundred thousand, five hundred twenty-one".