440388990 has 96 divisors (see below), whose sum is σ = 1171123200. Its totient is φ = 114789312.

The previous prime is 440388989. The next prime is 440388997. The reversal of 440388990 is 99883044.

It is a happy number.

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 (440388997) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1199787 + ... + 1200153.

It is an arithmetic number, because the mean of its divisors is an integer number (12199200).

Almost surely, 2^440388990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 440388990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585561600).

440388990 is an abundant number, since it is smaller than the sum of its proper divisors (730734210).

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

440388990 is a wasteful number, since it uses less digits than its factorization.

440388990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 440388990 is about 20985.4471003122. The cubic root of 440388990 is about 760.8145640848.

The spelling of 440388990 in words is "four hundred forty million, three hundred eighty-eight thousand, nine hundred ninety".