40403040 has 96 divisors (see below), whose sum is σ = 130437216. Its totient is φ = 10506240.

The previous prime is 40403039. The next prime is 40403057. The reversal of 40403040 is 4030404.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18654 + ... + 20706.

It is an arithmetic number, because the mean of its divisors is an integer number (1358721).

Almost surely, 2^40403040 is an apocalyptic number.

40403040 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 40403040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65218608).

40403040 is an abundant number, since it is smaller than the sum of its proper divisors (90034176).

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

40403040 is a wasteful number, since it uses less digits than its factorization.

40403040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 40403040 is about 6356.3385687045. The cubic root of 40403040 is about 343.1400007045.

Adding to 40403040 its reverse (4030404), we get a palindrome (44433444).

The spelling of 40403040 in words is "forty million, four hundred three thousand, forty".