247438 has 4 divisors (see below), whose sum is σ = 371160. Its totient is φ = 123718.

The previous prime is 247433. The next prime is 247439. The reversal of 247438 is 834742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834742 = 2 ⋅417371.

It is a super-2 number, since 2×247438² = 122451127688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61858 + ... + 61861.

It is an arithmetic number, because the mean of its divisors is an integer number (92790).

2²⁴⁷⁴³⁸ is an apocalyptic number.

247438 is a deficient number, since it is larger than the sum of its proper divisors (123722).

247438 is a wasteful number, since it uses less digits than its factorization.

247438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123721.

The product of its digits is 5376, while the sum is 28.

The square root of 247438 is about 497.4314023059. The cubic root of 247438 is about 62.7801186610.

The spelling of 247438 in words is "two hundred forty-seven thousand, four hundred thirty-eight".