1397744773 has 4 divisors (see below), whose sum is σ = 1398019840. Its totient is φ = 1397469708.

The previous prime is 1397744759. The next prime is 1397744783. The reversal of 1397744773 is 3774477931.

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 1397744773 - 2⁹ = 1397744261 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 1397744773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397744783) 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, 129765 + ... + 140122.

It is an arithmetic number, because the mean of its divisors is an integer number (349504960).

Almost surely, 2^1397744773 is an apocalyptic number.

It is an amenable number.

1397744773 is a deficient number, since it is larger than the sum of its proper divisors (275067).

1397744773 is an equidigital number, since it uses as much as digits as its factorization.

1397744773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275066.

The product of its digits is 3111696, while the sum is 52.

The square root of 1397744773 is about 37386.4249828731. The cubic root of 1397744773 is about 1118.0879293641.

The spelling of 1397744773 in words is "one billion, three hundred ninety-seven million, seven hundred forty-four thousand, seven hundred seventy-three".