40002399 has 6 divisors (see below), whose sum is σ = 57781256. Its totient is φ = 26668260.

The previous prime is 40002379. The next prime is 40002421. The reversal of 40002399 is 99320004.

It is not a de Polignac number, because 40002399 - 2⁵ = 40002367 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 (40002329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2222347 + ... + 2222364.

Almost surely, 2^40002399 is an apocalyptic number.

40002399 is a deficient number, since it is larger than the sum of its proper divisors (17778857).

40002399 is a wasteful number, since it uses less digits than its factorization.

40002399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444717 (or 4444714 counting only the distinct ones).

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

The square root of 40002399 is about 6324.7449750958. The cubic root of 40002399 is about 342.0020262525.

It can be divided in two parts, 40002 and 399, that added together give a square (40401 = 201²).

The spelling of 40002399 in words is "forty million, two thousand, three hundred ninety-nine".