1247428238 has 8 divisors (see below), whose sum is σ = 2138448432. Its totient is φ = 534612096.

The previous prime is 1247428219. The next prime is 1247428279. The reversal of 1247428238 is 8328247421.

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

It is a junction number, because it is equal to n+sod(n) for n = 1247428195 and 1247428204.

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, 44550995 + ... + 44551022.

It is an arithmetic number, because the mean of its divisors is an integer number (267306054).

Almost surely, 2^1247428238 is an apocalyptic number.

1247428238 is a deficient number, since it is larger than the sum of its proper divisors (891020194).

1247428238 is an equidigital number, since it uses as much as digits as its factorization.

1247428238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89102026.

The product of its digits is 172032, while the sum is 41.

The square root of 1247428238 is about 35318.9501259593. The cubic root of 1247428238 is about 1076.4780786904.

The spelling of 1247428238 in words is "one billion, two hundred forty-seven million, four hundred twenty-eight thousand, two hundred thirty-eight".