40217820 has 24 divisors (see below), whose sum is σ = 112610064. Its totient is φ = 10724736.

The previous prime is 40217797. The next prime is 40217833. The reversal of 40217820 is 2871204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335089 + ... + 335208.

It is an arithmetic number, because the mean of its divisors is an integer number (4692086).

Almost surely, 2^40217820 is an apocalyptic number.

It is an amenable number.

40217820 is an abundant number, since it is smaller than the sum of its proper divisors (72392244).

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

40217820 is a wasteful number, since it uses less digits than its factorization.

40217820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670309 (or 670307 counting only the distinct ones).

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

The square root of 40217820 is about 6341.7521238219. The cubic root of 40217820 is about 342.6148441838.

The spelling of 40217820 in words is "forty million, two hundred seventeen thousand, eight hundred twenty".