40390838 has 8 divisors (see below), whose sum is σ = 60618432. Its totient is φ = 20184696.

The previous prime is 40390807. The next prime is 40390841. The reversal of 40390838 is 83809304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 40390798 and 40390807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731 + ... + 9017.

It is an arithmetic number, because the mean of its divisors is an integer number (7577304).

Almost surely, 2^40390838 is an apocalyptic number.

40390838 is a deficient number, since it is larger than the sum of its proper divisors (20227594).

40390838 is a wasteful number, since it uses less digits than its factorization.

40390838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 40390838 is about 6355.3786669246. The cubic root of 40390838 is about 343.1054536683.

The spelling of 40390838 in words is "forty million, three hundred ninety thousand, eight hundred thirty-eight".