1387725793 has 4 divisors (see below), whose sum is σ = 1469356740. Its totient is φ = 1306094848.

The previous prime is 1387725739. The next prime is 1387725803. The reversal of 1387725793 is 3975277831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 662393169 + 725332624 = 25737^2 + 26932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387725793 - 2⁹ = 1387725281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387725793.

It is not an unprimeable number, because it can be changed into a prime (1387725193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40815448 + ... + 40815481.

It is an arithmetic number, because the mean of its divisors is an integer number (367339185).

Almost surely, 2^1387725793 is an apocalyptic number.

It is an amenable number.

1387725793 is a deficient number, since it is larger than the sum of its proper divisors (81630947).

1387725793 is an equidigital number, since it uses as much as digits as its factorization.

1387725793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81630946.

The product of its digits is 2222640, while the sum is 52.

The square root of 1387725793 is about 37252.1917878667. The cubic root of 1387725793 is about 1115.4100506070.

The spelling of 1387725793 in words is "one billion, three hundred eighty-seven million, seven hundred twenty-five thousand, seven hundred ninety-three".