40287820 has 24 divisors (see below), whose sum is σ = 86892624. Its totient is φ = 15679296.

The previous prime is 40287803. The next prime is 40287823. The reversal of 40287820 is 2878204.

It is not an unprimeable number, because it can be changed into a prime (40287823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26482 + ... + 27961.

It is an arithmetic number, because the mean of its divisors is an integer number (3620526).

Almost surely, 2^40287820 is an apocalyptic number.

It is an amenable number.

40287820 is an abundant number, since it is smaller than the sum of its proper divisors (46604804).

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

40287820 is a wasteful number, since it uses less digits than its factorization.

40287820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54489 (or 54487 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 40287820 is about 6347.2687039387. The cubic root of 40287820 is about 342.8135051935.

The spelling of 40287820 in words is "forty million, two hundred eighty-seven thousand, eight hundred twenty".