40020105 has 16 divisors (see below), whose sum is σ = 64989504. Its totient is φ = 21024960.

The previous prime is 40020103. The next prime is 40020119. The reversal of 40020105 is 50102004.

It is not a de Polignac number, because 40020105 - 2¹ = 40020103 is a prime.

It is a super-2 number, since 2×40020105² = 3203217608422050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40020103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18906 + ... + 20915.

It is an arithmetic number, because the mean of its divisors is an integer number (4061844).

Almost surely, 2^40020105 is an apocalyptic number.

It is an amenable number.

40020105 is a deficient number, since it is larger than the sum of its proper divisors (24969399).

40020105 is a wasteful number, since it uses less digits than its factorization.

40020105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39896.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40020105 is about 6326.1445604728. The cubic root of 40020105 is about 342.0524781822.

Adding to 40020105 its reverse (50102004), we get a palindrome (90122109).

The spelling of 40020105 in words is "forty million, twenty thousand, one hundred five".