40406040 has 96 divisors (see below), whose sum is σ = 136216080. Its totient is φ = 10772352.

The previous prime is 40405993. The next prime is 40406081. The reversal of 40406040 is 4060404.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7642 + ... + 11798.

Almost surely, 2^40406040 is an apocalyptic number.

40406040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40406040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68108040).

40406040 is an abundant number, since it is smaller than the sum of its proper divisors (95810040).

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

40406040 is a wasteful number, since it uses less digits than its factorization.

40406040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4183 (or 4167 counting only the distinct ones).

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

The square root of 40406040 is about 6356.5745492364. The cubic root of 40406040 is about 343.1484934196.

Adding to 40406040 its reverse (4060404), we get a palindrome (44466444).

The spelling of 40406040 in words is "forty million, four hundred six thousand, forty".