40040001 has 20 divisors (see below), whose sum is σ = 59983572. Its totient is φ = 26617248.

The previous prime is 40039999. The next prime is 40040017. The reversal of 40040001 is 10004004.

It can be written as a sum of positive squares in 2 ways, for example, as 16769025 + 23270976 = 4095^2 + 4824^2 .

It is not a de Polignac number, because 40040001 - 2¹ = 40039999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (40040041) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 52515 + ... + 53271.

Almost surely, 2^40040001 is an apocalyptic number.

It is an amenable number.

40040001 is a deficient number, since it is larger than the sum of its proper divisors (19943571).

40040001 is an equidigital number, since it uses as much as digits as its factorization.

40040001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 40040001 is about 6327.7168868400. The cubic root of 40040001 is about 342.1091526015.

Adding to 40040001 its reverse (10004004), we get a palindrome (50044005).

It can be divided in two parts, 4004000 and 1, that added together give a square (4004001 = 2001²).

The spelling of 40040001 in words is "forty million, forty thousand, one".