1428638347 has 4 divisors (see below), whose sum is σ = 1434932136. Its totient is φ = 1422344560.

The previous prime is 1428638327. The next prime is 1428638359. The reversal of 1428638347 is 7438368241.

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 1428638347 - 2⁷ = 1428638219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1428638297 and 1428638306.

It is not an unprimeable number, because it can be changed into a prime (1428638327) 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, 3146554 + ... + 3147007.

It is an arithmetic number, because the mean of its divisors is an integer number (358733034).

Almost surely, 2^1428638347 is an apocalyptic number.

1428638347 is a deficient number, since it is larger than the sum of its proper divisors (6293789).

1428638347 is an equidigital number, since it uses as much as digits as its factorization.

1428638347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293788.

The product of its digits is 774144, while the sum is 46.

The square root of 1428638347 is about 37797.3325381567. The cubic root of 1428638347 is about 1126.2654657413.

The spelling of 1428638347 in words is "one billion, four hundred twenty-eight million, six hundred thirty-eight thousand, three hundred forty-seven".