4040406 has 12 divisors (see below), whose sum is σ = 8754252. Its totient is φ = 1346796.

The previous prime is 4040401. The next prime is 4040411. The reversal of 4040406 is 6040404.

It is an interprime number because it is at equal distance from previous prime (4040401) and next prime (4040411).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 224467 = 4040406 / (4 + 0 + 4 + 0 + 4 + 0 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4040401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112216 + ... + 112251.

It is an arithmetic number, because the mean of its divisors is an integer number (729521).

Almost surely, 2^4040406 is an apocalyptic number.

4040406 is an abundant number, since it is smaller than the sum of its proper divisors (4713846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4040406 is a wasteful number, since it uses less digits than its factorization.

4040406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224475 (or 224472 counting only the distinct ones).

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

The square root of 4040406 is about 2010.0761179617. The cubic root of 4040406 is about 159.2728198550.

The spelling of 4040406 in words is "four million, forty thousand, four hundred six".