40221690 has 16 divisors (see below), whose sum is σ = 96532128. Its totient is φ = 10725776.

The previous prime is 40221683. The next prime is 40221691. The reversal of 40221690 is 9612204.

It is a super-2 number, since 2×40221690² = 3235568692912200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40221690.

It is not an unprimeable number, because it can be changed into a prime (40221691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670332 + ... + 670391.

It is an arithmetic number, because the mean of its divisors is an integer number (6033258).

Almost surely, 2^40221690 is an apocalyptic number.

40221690 is an abundant number, since it is smaller than the sum of its proper divisors (56310438).

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

40221690 is a wasteful number, since it uses less digits than its factorization.

40221690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340733.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 40221690 is about 6342.0572372062. The cubic root of 40221690 is about 342.6258333168.

Adding to 40221690 its reverse (9612204), we get a palindrome (49833894).

The spelling of 40221690 in words is "forty million, two hundred twenty-one thousand, six hundred ninety".