1381028773 has 4 divisors (see below), whose sum is σ = 1382217408. Its totient is φ = 1379840140.

The previous prime is 1381028743. The next prime is 1381028809. The reversal of 1381028773 is 3778201831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1381028773 - 2⁵ = 1381028741 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381028743) 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, 592573 + ... + 594898.

It is an arithmetic number, because the mean of its divisors is an integer number (345554352).

Almost surely, 2^1381028773 is an apocalyptic number.

It is an amenable number.

1381028773 is a deficient number, since it is larger than the sum of its proper divisors (1188635).

1381028773 is a wasteful number, since it uses less digits than its factorization.

1381028773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188634.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1381028773 is about 37162.1954814298. The cubic root of 1381028773 is about 1113.6128722949.

The spelling of 1381028773 in words is "one billion, three hundred eighty-one million, twenty-eight thousand, seven hundred seventy-three".