40034721 has 4 divisors (see below), whose sum is σ = 53379632. Its totient is φ = 26689812.

The previous prime is 40034707. The next prime is 40034723. The reversal of 40034721 is 12743004.

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 not a de Polignac number, because 40034721 - 2⁹ = 40034209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40034723) 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, 6672451 + ... + 6672456.

It is an arithmetic number, because the mean of its divisors is an integer number (13344908).

Almost surely, 2^40034721 is an apocalyptic number.

It is an amenable number.

40034721 is a deficient number, since it is larger than the sum of its proper divisors (13344911).

40034721 is a wasteful number, since it uses less digits than its factorization.

40034721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344910.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40034721 is about 6327.2996609928. The cubic root of 40034721 is about 342.0941141759.

Adding to 40034721 its reverse (12743004), we get a palindrome (52777725).

It can be divided in two parts, 40034 and 721, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 40034721 in words is "forty million, thirty-four thousand, seven hundred twenty-one".