40022640 has 160 divisors (see below), whose sum is σ = 157608960. Its totient is φ = 9144576.

The previous prime is 40022621. The next prime is 40022657. The reversal of 40022640 is 4622004.

40022640 is a `hidden beast` number, since 4 + 0 + 0 + 22 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13797 + ... + 16443.

It is an arithmetic number, because the mean of its divisors is an integer number (985056).

Almost surely, 2^40022640 is an apocalyptic number.

40022640 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 40022640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78804480).

40022640 is an abundant number, since it is smaller than the sum of its proper divisors (117586320).

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

40022640 is a wasteful number, since it uses less digits than its factorization.

40022640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676 (or 2664 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40022640 is about 6326.3449163004. The cubic root of 40022640 is about 342.0597002582.

Adding to 40022640 its reverse (4622004), we get a palindrome (44644644).

The spelling of 40022640 in words is "forty million, twenty-two thousand, six hundred forty".