1388947172 has 24 divisors (see below), whose sum is σ = 2481897600. Its totient is φ = 679985856.

The previous prime is 1388947151. The next prime is 1388947193. The reversal of 1388947172 is 2717498831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1388947151) and next prime (1388947193).

It is a self number, because there is not a number n which added to its sum of digits gives 1388947172.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17729 + ... + 55607.

It is an arithmetic number, because the mean of its divisors is an integer number (103412400).

Almost surely, 2^1388947172 is an apocalyptic number.

It is an amenable number.

1388947172 is a deficient number, since it is larger than the sum of its proper divisors (1092950428).

1388947172 is a wasteful number, since it uses less digits than its factorization.

1388947172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38075 (or 38073 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The square root of 1388947172 is about 37268.5815667836. The cubic root of 1388947172 is about 1115.7371899060.

The spelling of 1388947172 in words is "one billion, three hundred eighty-eight million, nine hundred forty-seven thousand, one hundred seventy-two".