40220081 has 4 divisors (see below), whose sum is σ = 43876464. Its totient is φ = 36563700.

The previous prime is 40220069. The next prime is 40220083. The reversal of 40220081 is 18002204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40220081 - 2²² = 36025777 is a prime.

It is a super-2 number, since 2×40220081² = 3235309831293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40220083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828175 + ... + 1828196.

It is an arithmetic number, because the mean of its divisors is an integer number (10969116).

Almost surely, 2^40220081 is an apocalyptic number.

It is an amenable number.

40220081 is a deficient number, since it is larger than the sum of its proper divisors (3656383).

40220081 is a wasteful number, since it uses less digits than its factorization.

40220081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656382.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 40220081 is about 6341.9303843546. The cubic root of 40220081 is about 342.6212645355.

Adding to 40220081 its reverse (18002204), we get a palindrome (58222285).

The spelling of 40220081 in words is "forty million, two hundred twenty thousand, eighty-one".