40404321 has 12 divisors (see below), whose sum is σ = 59351760. Its totient is φ = 26479320.

The previous prime is 40404319. The next prime is 40404361. The reversal of 40404321 is 12340404.

It is not a de Polignac number, because 40404321 - 2¹ = 40404319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40404294 and 40404303.

It is not an unprimeable number, because it can be changed into a prime (40404361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37515 + ... + 38576.

It is an arithmetic number, because the mean of its divisors is an integer number (4945980).

Almost surely, 2^40404321 is an apocalyptic number.

It is an amenable number.

40404321 is a deficient number, since it is larger than the sum of its proper divisors (18947439).

40404321 is a wasteful number, since it uses less digits than its factorization.

40404321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76156 (or 76153 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40404321 is about 6356.4393334634. The cubic root of 40404321 is about 343.1436271453.

Adding to 40404321 its reverse (12340404), we get a palindrome (52744725).

The spelling of 40404321 in words is "forty million, four hundred four thousand, three hundred twenty-one".