1381685473 has 16 divisors (see below), whose sum is σ = 1589124096. Its totient is φ = 1176786000.

The previous prime is 1381685447. The next prime is 1381685497. The reversal of 1381685473 is 3745861831.

It is a cyclic number.

It is not a de Polignac number, because 1381685473 - 2²⁹ = 844814561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381685443) 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, 1129140 + ... + 1130362.

It is an arithmetic number, because the mean of its divisors is an integer number (99320256).

Almost surely, 2^1381685473 is an apocalyptic number.

It is an amenable number.

1381685473 is a deficient number, since it is larger than the sum of its proper divisors (207438623).

1381685473 is a wasteful number, since it uses less digits than its factorization.

1381685473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 483840, while the sum is 46.

The square root of 1381685473 is about 37171.0300233932. The cubic root of 1381685473 is about 1113.7893575601.

It can be divided in two parts, 138168 and 5473, that added together give a square (143641 = 379²).

The spelling of 1381685473 in words is "one billion, three hundred eighty-one million, six hundred eighty-five thousand, four hundred seventy-three".