247878493 has 4 divisors (see below), whose sum is σ = 251578240. Its totient is φ = 244178748.

The previous prime is 247878443. The next prime is 247878569. The reversal of 247878493 is 394878742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247878493 is a prime.

It is a super-2 number, since 2×247878493² = 122887494583902098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247878493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247878413) 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, 1849773 + ... + 1849906.

It is an arithmetic number, because the mean of its divisors is an integer number (62894560).

Almost surely, 2^247878493 is an apocalyptic number.

It is an amenable number.

247878493 is a deficient number, since it is larger than the sum of its proper divisors (3699747).

247878493 is an equidigital number, since it uses as much as digits as its factorization.

247878493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699746.

The product of its digits is 2709504, while the sum is 52.

The square root of 247878493 is about 15744.1574242638. The cubic root of 247878493 is about 628.1735062596.

The spelling of 247878493 in words is "two hundred forty-seven million, eight hundred seventy-eight thousand, four hundred ninety-three".