247420399 has 4 divisors (see below), whose sum is σ = 247878280. Its totient is φ = 246962520.

The previous prime is 247420387. The next prime is 247420421. The reversal of 247420399 is 993024742.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 247420399 - 2¹¹ = 247418351 is a prime.

It is a super-2 number, since 2×247420399² = 122433707682638402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247420309) 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, 228129 + ... + 229210.

It is an arithmetic number, because the mean of its divisors is an integer number (61969570).

Almost surely, 2^247420399 is an apocalyptic number.

247420399 is a deficient number, since it is larger than the sum of its proper divisors (457881).

247420399 is an equidigital number, since it uses as much as digits as its factorization.

247420399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457880.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 247420399 is about 15729.6026332517. The cubic root of 247420399 is about 627.7863004688.

The spelling of 247420399 in words is "two hundred forty-seven million, four hundred twenty thousand, three hundred ninety-nine".