40247 has 4 divisors (see below), whose sum is σ = 40656. Its totient is φ = 39840.

The previous prime is 40241. The next prime is 40253. The reversal of 40247 is 74204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (40241) and next prime (40253).

It is a cyclic number.

It is not a de Polignac number, because 40247 - 2⁴ = 40231 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47 + ... + 287.

It is an arithmetic number, because the mean of its divisors is an integer number (10164).

2⁴⁰²⁴⁷ is an apocalyptic number.

40247 is a deficient number, since it is larger than the sum of its proper divisors (409).

40247 is a wasteful number, since it uses less digits than its factorization.

40247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 40247 is about 200.6165496663. The cubic root of 40247 is about 34.2697685440.

The spelling of 40247 in words is "forty thousand, two hundred forty-seven", and thus it is an iban number.