40228081 has 4 divisors (see below), whose sum is σ = 41977152. Its totient is φ = 38479012.

The previous prime is 40228051. The next prime is 40228109. The reversal of 40228081 is 18082204.

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 40228081 - 2¹³ = 40219889 is a prime.

It is a super-2 number, since 2×40228081² = 3236597001885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40228051) 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, 874501 + ... + 874546.

It is an arithmetic number, because the mean of its divisors is an integer number (10494288).

Almost surely, 2^40228081 is an apocalyptic number.

It is an amenable number.

40228081 is a deficient number, since it is larger than the sum of its proper divisors (1749071).

40228081 is a wasteful number, since it uses less digits than its factorization.

40228081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749070.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 40228081 is about 6342.5610757800. The cubic root of 40228081 is about 342.6439794608.

The spelling of 40228081 in words is "forty million, two hundred twenty-eight thousand, eighty-one".