247242745 has 24 divisors (see below), whose sum is σ = 308534400. Its totient is φ = 190116576.

The previous prime is 247242731. The next prime is 247242761. The reversal of 247242745 is 547242742.

It is not a de Polignac number, because 247242745 - 2¹⁷ = 247111673 is a prime.

It is a super-2 number, since 2×247242745² = 122257949910270050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2400364 + ... + 2400466.

It is an arithmetic number, because the mean of its divisors is an integer number (12855600).

Almost surely, 2^247242745 is an apocalyptic number.

It is an amenable number.

247242745 is a deficient number, since it is larger than the sum of its proper divisors (61291655).

247242745 is an equidigital number, since it uses as much as digits as its factorization.

247242745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 246 counting only the distinct ones).

The product of its digits is 125440, while the sum is 37.

The square root of 247242745 is about 15723.9544962455. The cubic root of 247242745 is about 627.6360090996.

The spelling of 247242745 in words is "two hundred forty-seven million, two hundred forty-two thousand, seven hundred forty-five".