40168820 has 12 divisors (see below), whose sum is σ = 84354564. Its totient is φ = 16067520.

The previous prime is 40168819. The next prime is 40168861. The reversal of 40168820 is 2886104.

It can be written as a sum of positive squares in 2 ways, for example, as 16859236 + 23309584 = 4106^2 + 4828^2 .

It is a super-2 number, since 2×40168820² = 3227068200384800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004201 + ... + 1004240.

It is an arithmetic number, because the mean of its divisors is an integer number (7029547).

Almost surely, 2^40168820 is an apocalyptic number.

It is an amenable number.

40168820 is an abundant number, since it is smaller than the sum of its proper divisors (44185744).

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

40168820 is a wasteful number, since it uses less digits than its factorization.

40168820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008450 (or 2008448 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 40168820 is about 6337.8876607273. The cubic root of 40168820 is about 342.4756442801.

The spelling of 40168820 in words is "forty million, one hundred sixty-eight thousand, eight hundred twenty".