247403 has 4 divisors (see below), whose sum is σ = 266448. Its totient is φ = 228360.

The previous prime is 247393. The next prime is 247409. The reversal of 247403 is 304742.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 247403 - 2⁶ = 247339 is a prime.

It is a super-2 number, since 2×247403² = 122416488818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9503 + ... + 9528.

It is an arithmetic number, because the mean of its divisors is an integer number (66612).

2²⁴⁷⁴⁰³ is an apocalyptic number.

247403 is a deficient number, since it is larger than the sum of its proper divisors (19045).

247403 is a wasteful number, since it uses less digits than its factorization.

247403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19044.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 247403 is about 497.3962203314. The cubic root of 247403 is about 62.7771584477. Note that the first 3 decimals are identical.

The spelling of 247403 in words is "two hundred forty-seven thousand, four hundred three", and thus it is an iban number.