40032421 has 16 divisors (see below), whose sum is σ = 47412288. Its totient is φ = 33321600.

The previous prime is 40032403. The next prime is 40032451. The reversal of 40032421 is 12423004.

It is not a de Polignac number, because 40032421 - 2²³ = 31643813 is a prime.

It is a super-2 number, since 2×40032421² = 3205189462242482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40032395 and 40032404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40032401) 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, 17665 + ... + 19801.

It is an arithmetic number, because the mean of its divisors is an integer number (2963268).

Almost surely, 2^40032421 is an apocalyptic number.

It is an amenable number.

40032421 is a deficient number, since it is larger than the sum of its proper divisors (7379867).

40032421 is a wasteful number, since it uses less digits than its factorization.

40032421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40032421 is about 6327.1179062824. The cubic root of 40032421 is about 342.0875629331.

Adding to 40032421 its reverse (12423004), we get a palindrome (52455425).

The spelling of 40032421 in words is "forty million, thirty-two thousand, four hundred twenty-one".