40491880 has 64 divisors (see below), whose sum is σ = 107049600. Its totient is φ = 13589760.

The previous prime is 40491833. The next prime is 40491881. The reversal of 40491880 is 8819404.

It is not an unprimeable number, because it can be changed into a prime (40491881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2181 + ... + 9259.

It is an arithmetic number, because the mean of its divisors is an integer number (1672650).

Almost surely, 2^40491880 is an apocalyptic number.

40491880 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 40491880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53524800).

40491880 is an abundant number, since it is smaller than the sum of its proper divisors (66557720).

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

40491880 is a wasteful number, since it uses less digits than its factorization.

40491880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7114 (or 7110 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 40491880 is about 6363.3230312471. The cubic root of 40491880 is about 343.3913204180.

It can be divided in two parts, 4049 and 1880, that added together give a square (5929 = 77²).

The spelling of 40491880 in words is "forty million, four hundred ninety-one thousand, eight hundred eighty".