40640033 has 4 divisors (see below), whose sum is σ = 46445760. Its totient is φ = 34834308.

The previous prime is 40640009. The next prime is 40640051. The reversal of 40640033 is 33004604.

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 not a de Polignac number, because 40640033 - 2¹⁰ = 40639009 is a prime.

It is a super-2 number, since 2×40640033² = 3303224564482178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40639987 and 40640014.

It is not an unprimeable number, because it can be changed into a prime (40640053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2902853 + ... + 2902866.

It is an arithmetic number, because the mean of its divisors is an integer number (11611440).

Almost surely, 2^40640033 is an apocalyptic number.

It is an amenable number.

40640033 is a deficient number, since it is larger than the sum of its proper divisors (5805727).

40640033 is an equidigital number, since it uses as much as digits as its factorization.

40640033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805726.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 40640033 is about 6374.9535684584. The cubic root of 40640033 is about 343.8096144322.

Adding to 40640033 its reverse (33004604), we get a palindrome (73644637).

The spelling of 40640033 in words is "forty million, six hundred forty thousand, thirty-three".