40237820 has 72 divisors (see below), whose sum is σ = 103516560. Its totient is φ = 13063680.

The previous prime is 40237807. The next prime is 40237853. The reversal of 40237820 is 2873204.

It is a self number, because there is not a number n which added to its sum of digits gives 40237820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17540 + ... + 19700.

It is an arithmetic number, because the mean of its divisors is an integer number (1437730).

Almost surely, 2^40237820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40237820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51758280).

40237820 is an abundant number, since it is smaller than the sum of its proper divisors (63278740).

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

40237820 is a wasteful number, since it uses less digits than its factorization.

40237820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203 (or 2194 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 40237820 is about 6343.3287791191. The cubic root of 40237820 is about 342.6716279787.

The spelling of 40237820 in words is "forty million, two hundred thirty-seven thousand, eight hundred twenty".