40440080 has 20 divisors (see below), whose sum is σ = 94023372. Its totient is φ = 16176000.

The previous prime is 40440079. The next prime is 40440091. The reversal of 40440080 is 8004404.

It can be written as a sum of positive squares in 2 ways, for example, as 25725184 + 14714896 = 5072^2 + 3836^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252671 + ... + 252830.

Almost surely, 2^40440080 is an apocalyptic number.

40440080 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40440080 is an abundant number, since it is smaller than the sum of its proper divisors (53583292).

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

40440080 is a wasteful number, since it uses less digits than its factorization.

40440080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505514 (or 505508 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 40440080 is about 6359.2515282854. The cubic root of 40440080 is about 343.2448279948.

Adding to 40440080 its reverse (8004404), we get a palindrome (48444484).

The spelling of 40440080 in words is "forty million, four hundred forty thousand, eighty".