40007643 has 32 divisors (see below), whose sum is σ = 59496192. Its totient is φ = 23760000.

The previous prime is 40007641. The next prime is 40007651. The reversal of 40007643 is 34670004.

It is not a de Polignac number, because 40007643 - 2¹ = 40007641 is a prime.

It is a super-2 number, since 2×40007643² = 3201222996830898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40007641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159268 + ... + 159518.

It is an arithmetic number, because the mean of its divisors is an integer number (1859256).

Almost surely, 2^40007643 is an apocalyptic number.

40007643 is a deficient number, since it is larger than the sum of its proper divisors (19488549).

40007643 is a wasteful number, since it uses less digits than its factorization.

40007643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 40007643 is about 6325.1595236800. The cubic root of 40007643 is about 342.0169701917.

Adding to 40007643 its reverse (34670004), we get a palindrome (74677647).

The spelling of 40007643 in words is "forty million, seven thousand, six hundred forty-three".