247420405 has 4 divisors (see below), whose sum is σ = 296904492. Its totient is φ = 197936320.

The previous prime is 247420387. The next prime is 247420421. The reversal of 247420405 is 504024742.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81757764 + 165662641 = 9042^2 + 12871^2 .

It is not a de Polignac number, because 247420405 - 2¹³ = 247412213 is a prime.

It is a super-2 number, since 2×247420405² = 122433713620728050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24742036 + ... + 24742045.

It is an arithmetic number, because the mean of its divisors is an integer number (74226123).

Almost surely, 2^247420405 is an apocalyptic number.

It is an amenable number.

247420405 is a deficient number, since it is larger than the sum of its proper divisors (49484087).

247420405 is an equidigital number, since it uses as much as digits as its factorization.

247420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49484086.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 247420405 is about 15729.6028239749. The cubic root of 247420405 is about 627.7863055434.

The spelling of 247420405 in words is "two hundred forty-seven million, four hundred twenty thousand, four hundred five".