247398739 has 24 divisors (see below), whose sum is σ = 310782240. Its totient is φ = 192654336.

The previous prime is 247398727. The next prime is 247398743. The reversal of 247398739 is 937893742.

It is a happy number.

It is not a de Polignac number, because 247398739 - 2⁷ = 247398611 is a prime.

It is a super-2 number, since 2×247398739² = 122412272117580242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247398709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56559 + ... + 60775.

It is an arithmetic number, because the mean of its divisors is an integer number (12949260).

Almost surely, 2^247398739 is an apocalyptic number.

247398739 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

247398739 is a deficient number, since it is larger than the sum of its proper divisors (63383501).

247398739 is a wasteful number, since it uses less digits than its factorization.

247398739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287 (or 4270 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 52.

The square root of 247398739 is about 15728.9141074646. The cubic root of 247398739 is about 627.7679804378.

The spelling of 247398739 in words is "two hundred forty-seven million, three hundred ninety-eight thousand, seven hundred thirty-nine".