247484639 has 4 divisors (see below), whose sum is σ = 248108424. Its totient is φ = 246860856.

The previous prime is 247484581. The next prime is 247484641. The reversal of 247484639 is 936484742.

It is a happy number.

247484639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936484742 = 2 ⋅468242371.

It is a cyclic number.

It is not a de Polignac number, because 247484639 - 2¹⁶ = 247419103 is a prime.

It is a super-2 number, since 2×247484639² = 122497293081920642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247484593 and 247484602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247484659) 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, 311297 + ... + 312090.

It is an arithmetic number, because the mean of its divisors is an integer number (62027106).

Almost surely, 2^247484639 is an apocalyptic number.

247484639 is a deficient number, since it is larger than the sum of its proper divisors (623785).

247484639 is an equidigital number, since it uses as much as digits as its factorization.

247484639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623784.

The product of its digits is 1161216, while the sum is 47.

The square root of 247484639 is about 15731.6445103492. The cubic root of 247484639 is about 627.8406283823.

The spelling of 247484639 in words is "two hundred forty-seven million, four hundred eighty-four thousand, six hundred thirty-nine".