40023909 has 16 divisors (see below), whose sum is σ = 59693440. Its totient is φ = 26503200.

The previous prime is 40023901. The next prime is 40023911. The reversal of 40023909 is 90932004.

It is not a de Polignac number, because 40023909 - 2³ = 40023901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40023901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 832 + ... + 8985.

It is an arithmetic number, because the mean of its divisors is an integer number (3730840).

Almost surely, 2^40023909 is an apocalyptic number.

It is an amenable number.

40023909 is a deficient number, since it is larger than the sum of its proper divisors (19669531).

40023909 is a wasteful number, since it uses less digits than its factorization.

40023909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9977 (or 9971 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 40023909 is about 6326.4452103847. The cubic root of 40023909 is about 342.0633154551.

The spelling of 40023909 in words is "forty million, twenty-three thousand, nine hundred nine".