40002406 has 4 divisors (see below), whose sum is σ = 60003612. Its totient is φ = 20001202.

The previous prime is 40002379. The next prime is 40002421. The reversal of 40002406 is 60420004.

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

It is a self number, because there is not a number n which added to its sum of digits gives 40002406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000600 + ... + 10000603.

It is an arithmetic number, because the mean of its divisors is an integer number (15000903).

Almost surely, 2^40002406 is an apocalyptic number.

40002406 is a deficient number, since it is larger than the sum of its proper divisors (20001206).

40002406 is a wasteful number, since it uses less digits than its factorization.

40002406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20001205.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40002406 is about 6324.7455284778. The cubic root of 40002406 is about 342.0020462014.

The spelling of 40002406 in words is "forty million, two thousand, four hundred six".