40420440 has 48 divisors (see below), whose sum is σ = 131367600. Its totient is φ = 10778688.

The previous prime is 40420433. The next prime is 40420451. The reversal of 40420440 is 4402404.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 55780 + ... + 56499.

It is an arithmetic number, because the mean of its divisors is an integer number (2736825).

Almost surely, 2^40420440 is an apocalyptic number.

40420440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40420440 is an abundant number, since it is smaller than the sum of its proper divisors (90947160).

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

40420440 is a wasteful number, since it uses less digits than its factorization.

40420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112296 (or 112289 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40420440 is about 6357.7071338652. The cubic root of 40420440 is about 343.1892526016.

Adding to 40420440 its reverse (4402404), we get a palindrome (44822844).

The spelling of 40420440 in words is "forty million, four hundred twenty thousand, four hundred forty".