40381986 has 8 divisors (see below), whose sum is σ = 80763984. Its totient is φ = 13460660.

The previous prime is 40381967. The next prime is 40382003. The reversal of 40381986 is 68918304.

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

40381986 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365160 + ... + 3365171.

It is an arithmetic number, because the mean of its divisors is an integer number (10095498).

Almost surely, 2^40381986 is an apocalyptic number.

40381986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40381986 is a wasteful number, since it uses less digits than its factorization.

40381986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730336.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 40381986 is about 6354.6822107797. The cubic root of 40381986 is about 343.0803869986.

The spelling of 40381986 in words is "forty million, three hundred eighty-one thousand, nine hundred eighty-six".