1247672144 has 10 divisors (see below), whose sum is σ = 2417364810. Its totient is φ = 623836064.

The previous prime is 1247672123. The next prime is 1247672203. The reversal of 1247672144 is 4412767421.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1247502400 + 169744 = 35320^2 + 412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1247672098 and 1247672107.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 38989739 + ... + 38989770.

It is an arithmetic number, because the mean of its divisors is an integer number (241736481).

Almost surely, 2^1247672144 is an apocalyptic number.

It is an amenable number.

1247672144 is a deficient number, since it is larger than the sum of its proper divisors (1169692666).

1247672144 is an equidigital number, since it uses as much as digits as its factorization.

1247672144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77979517 (or 77979511 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 1247672144 is about 35322.4028627725. The cubic root of 1247672144 is about 1076.5482343230.

The spelling of 1247672144 in words is "one billion, two hundred forty-seven million, six hundred seventy-two thousand, one hundred forty-four".