40183781 has 8 divisors (see below), whose sum is σ = 45251328. Its totient is φ = 35352000.

The previous prime is 40183769. The next prime is 40183807. The reversal of 40183781 is 18738104.

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

It is a cyclic number.

It is not a de Polignac number, because 40183781 - 2¹⁰ = 40182757 is a prime.

It is a super-2 number, since 2×40183781² = 3229472510911922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40183711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58580 + ... + 59261.

It is an arithmetic number, because the mean of its divisors is an integer number (5656416).

Almost surely, 2^40183781 is an apocalyptic number.

It is an amenable number.

40183781 is a deficient number, since it is larger than the sum of its proper divisors (5067547).

40183781 is a wasteful number, since it uses less digits than its factorization.

40183781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117883.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 40183781 is about 6339.0678336803. The cubic root of 40183781 is about 342.5181577032.

The spelling of 40183781 in words is "forty million, one hundred eighty-three thousand, seven hundred eighty-one".