1247189428 has 48 divisors (see below), whose sum is σ = 2435968080. Its totient is φ = 555935744.

The previous prime is 1247189423. The next prime is 1247189429. The reversal of 1247189428 is 8249817421.

It can be written as a sum of positive squares in 8 ways, for example, as 250019344 + 997170084 = 15812^2 + 31578^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247189423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98550 + ... + 110482.

It is an arithmetic number, because the mean of its divisors is an integer number (50749335).

Almost surely, 2^1247189428 is an apocalyptic number.

It is an amenable number.

1247189428 is a deficient number, since it is larger than the sum of its proper divisors (1188778652).

1247189428 is a wasteful number, since it uses less digits than its factorization.

1247189428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12036 (or 12034 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 1247189428 is about 35315.5692011328. The cubic root of 1247189428 is about 1076.4093799792.

The spelling of 1247189428 in words is "one billion, two hundred forty-seven million, one hundred eighty-nine thousand, four hundred twenty-eight".