1247680189 has 12 divisors (see below), whose sum is σ = 1482266304. Its totient is φ = 1046684184.

The previous prime is 1247680127. The next prime is 1247680193. The reversal of 1247680189 is 9810867421.

It is not a de Polignac number, because 1247680189 - 2⁹ = 1247679677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247680289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268579 + ... + 273184.

It is an arithmetic number, because the mean of its divisors is an integer number (123522192).

Almost surely, 2^1247680189 is an apocalyptic number.

It is an amenable number.

1247680189 is a deficient number, since it is larger than the sum of its proper divisors (234586115).

1247680189 is an equidigital number, since it uses as much as digits as its factorization.

1247680189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541824 (or 541817 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1247680189 is about 35322.5167421575. The cubic root of 1247680189 is about 1076.5505481819.

It can be divided in two parts, 12476 and 80189, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 1247680189 in words is "one billion, two hundred forty-seven million, six hundred eighty thousand, one hundred eighty-nine".