40821720 has 64 divisors (see below), whose sum is σ = 123275520. Its totient is φ = 10813824.

The previous prime is 40821707. The next prime is 40821779. The reversal of 40821720 is 2712804.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18517 + ... + 20603.

It is an arithmetic number, because the mean of its divisors is an integer number (1926180).

Almost surely, 2^40821720 is an apocalyptic number.

40821720 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 40821720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61637760).

40821720 is an abundant number, since it is smaller than the sum of its proper divisors (82453800).

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

40821720 is a wasteful number, since it uses less digits than its factorization.

40821720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 40821720 is about 6389.1877418026. The cubic root of 40821720 is about 344.3212026047.

The spelling of 40821720 in words is "forty million, eight hundred twenty-one thousand, seven hundred twenty".