40502309 has 4 divisors (see below), whose sum is σ = 41597004. Its totient is φ = 39407616.

The previous prime is 40502303. The next prime is 40502311. The reversal of 40502309 is 90320504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16785409 + 23716900 = 4097^2 + 4870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40502309 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 (40502303) 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, 547292 + ... + 547365.

It is an arithmetic number, because the mean of its divisors is an integer number (10399251).

Almost surely, 2^40502309 is an apocalyptic number.

It is an amenable number.

40502309 is a deficient number, since it is larger than the sum of its proper divisors (1094695).

40502309 is a wasteful number, since it uses less digits than its factorization.

40502309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094694.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 40502309 is about 6364.1424402664. The cubic root of 40502309 is about 343.4207989264.

The spelling of 40502309 in words is "forty million, five hundred two thousand, three hundred nine".