400247 has 2 divisors, whose sum is σ = 400248. Its totient is φ = 400246.

The previous prime is 400243. The next prime is 400249. The reversal of 400247 is 742004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400247 - 2² = 400243 is a prime.

It is a super-2 number, since 2×400247² = 320395322018, which contains 22 as substring.

Together with 400249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200123 + 200124.

It is an arithmetic number, because the mean of its divisors is an integer number (200124).

2⁴⁰⁰²⁴⁷ is an apocalyptic number.

400247 is a deficient number, since it is larger than the sum of its proper divisors (1).

400247 is an equidigital number, since it uses as much as digits as its factorization.

400247 is an evil number, because the sum of its binary digits is even.

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

The square root of 400247 is about 632.6507725436. The cubic root of 400247 is about 73.6957927819.

The spelling of 400247 in words is "four hundred thousand, two hundred forty-seven", and thus it is an iban number.