247661426 has 8 divisors (see below), whose sum is σ = 372057840. Its totient is φ = 123642148.

The previous prime is 247661399. The next prime is 247661431. The reversal of 247661426 is 624166742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×247661426² = 122672363856706952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247661426.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92636 + ... + 95271.

It is an arithmetic number, because the mean of its divisors is an integer number (46507230).

Almost surely, 2^247661426 is an apocalyptic number.

247661426 is a deficient number, since it is larger than the sum of its proper divisors (124396414).

247661426 is a wasteful number, since it uses less digits than its factorization.

247661426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188568.

The product of its digits is 96768, while the sum is 38.

The square root of 247661426 is about 15737.2623413350. The cubic root of 247661426 is about 627.9900890291.

The spelling of 247661426 in words is "two hundred forty-seven million, six hundred sixty-one thousand, four hundred twenty-six".