40869990 has 96 divisors (see below), whose sum is σ = 125686080. Its totient is φ = 9015552.

The previous prime is 40869979. The next prime is 40869991. The reversal of 40869990 is 9996804.

40869990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40869991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17152 + ... + 19388.

It is an arithmetic number, because the mean of its divisors is an integer number (1309230).

Almost surely, 2^40869990 is an apocalyptic number.

40869990 is the 5220-th pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40869990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62843040).

40869990 is an abundant number, since it is smaller than the sum of its proper divisors (84816090).

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

40869990 is a wasteful number, since it uses less digits than its factorization.

40869990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2286 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 40869990 is about 6392.9641012601. The cubic root of 40869990 is about 344.4568643535.

The spelling of 40869990 in words is "forty million, eight hundred sixty-nine thousand, nine hundred ninety".