40394 has 8 divisors (see below), whose sum is σ = 63840. Its totient is φ = 19116.

The previous prime is 40387. The next prime is 40423. The reversal of 40394 is 49304.

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

It is an Ulam number.

It is a Curzon number.

It is a congruent 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, 494 + ... + 569.

It is an arithmetic number, because the mean of its divisors is an integer number (7980).

2⁴⁰³⁹⁴ is an apocalyptic number.

40394 is a deficient number, since it is larger than the sum of its proper divisors (23446).

40394 is a wasteful number, since it uses less digits than its factorization.

40394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 40394 is about 200.9825863104. The cubic root of 40394 is about 34.3114406781.

Adding to 40394 its reverse (49304), we get a palindrome (89698).

It can be divided in two parts, 40 and 394, that added together give a palindrome (434).

The spelling of 40394 in words is "forty thousand, three hundred ninety-four".