40221640 has 16 divisors (see below), whose sum is σ = 90498780. Its totient is φ = 16088640.

The previous prime is 40221607. The next prime is 40221659. The reversal of 40221640 is 4612204.

It can be written as a sum of positive squares in 2 ways, for example, as 40220964 + 676 = 6342^2 + 26^2 .

It is a super-3 number, since 3×40221640³ (a number of 24 digits) contains 333 as substring.

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, 502731 + ... + 502810.

Almost surely, 2^40221640 is an apocalyptic number.

40221640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40221640 is an abundant number, since it is smaller than the sum of its proper divisors (50277140).

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

40221640 is a wasteful number, since it uses less digits than its factorization.

40221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005552 (or 1005548 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40221640 is about 6342.0532952664. The cubic root of 40221640 is about 342.6256913428.

Adding to 40221640 its reverse (4612204), we get a palindrome (44833844).

The spelling of 40221640 in words is "forty million, two hundred twenty-one thousand, six hundred forty".