40210081 has 4 divisors (see below), whose sum is σ = 40252464. Its totient is φ = 40167700.

The previous prime is 40210063. The next prime is 40210091. The reversal of 40210081 is 18001204.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-40210081 is a prime.

It is a super-2 number, since 2×40210081² = 3233701228053122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40210091) 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, 19735 + ... + 21676.

It is an arithmetic number, because the mean of its divisors is an integer number (10063116).

Almost surely, 2^40210081 is an apocalyptic number.

It is an amenable number.

40210081 is a deficient number, since it is larger than the sum of its proper divisors (42383).

40210081 is an equidigital number, since it uses as much as digits as its factorization.

40210081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42382.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 40210081 is about 6341.1419318605. The cubic root of 40210081 is about 342.5928666427.

Adding to 40210081 its reverse (18001204), we get a palindrome (58211285).

The spelling of 40210081 in words is "forty million, two hundred ten thousand, eighty-one".