40023309 has 4 divisors (see below), whose sum is σ = 53364416. Its totient is φ = 26682204.

The previous prime is 40023229. The next prime is 40023311. The reversal of 40023309 is 90332004.

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 40023309 - 2¹⁵ = 39990541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40023359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670549 + ... + 6670554.

It is an arithmetic number, because the mean of its divisors is an integer number (13341104).

Almost surely, 2^40023309 is an apocalyptic number.

It is an amenable number.

40023309 is a deficient number, since it is larger than the sum of its proper divisors (13341107).

40023309 is a wasteful number, since it uses less digits than its factorization.

40023309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13341106.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 40023309 is about 6326.3977902121. The cubic root of 40023309 is about 342.0616061517.

The spelling of 40023309 in words is "forty million, twenty-three thousand, three hundred nine".