40406481 has 6 divisors (see below), whose sum is σ = 58364930. Its totient is φ = 26937648.

The previous prime is 40406459. The next prime is 40406489. The reversal of 40406481 is 18460404.

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 147456 = 6345^2 + 384^2 .

It is not a de Polignac number, because 40406481 - 2¹¹ = 40404433 is a prime.

It is a super-2 number, since 2×40406481² = 3265367413606722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40406489) 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, 2244796 + ... + 2244813.

Almost surely, 2^40406481 is an apocalyptic number.

It is an amenable number.

40406481 is a deficient number, since it is larger than the sum of its proper divisors (17958449).

40406481 is a wasteful number, since it uses less digits than its factorization.

40406481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489615 (or 4489612 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 40406481 is about 6356.6092376361. The cubic root of 40406481 is about 343.1497418133.

Adding to 40406481 its reverse (18460404), we get a palindrome (58866885).

The spelling of 40406481 in words is "forty million, four hundred six thousand, four hundred eighty-one".