1397816783 has 4 divisors (see below), whose sum is σ = 1524891048. Its totient is φ = 1270742520.

The previous prime is 1397816759. The next prime is 1397816803. The reversal of 1397816783 is 3876187931.

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

It is a cyclic number.

It is not a de Polignac number, because 1397816783 - 2¹⁴ = 1397800399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397816723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63537116 + ... + 63537137.

It is an arithmetic number, because the mean of its divisors is an integer number (381222762).

Almost surely, 2^1397816783 is an apocalyptic number.

1397816783 is a deficient number, since it is larger than the sum of its proper divisors (127074265).

1397816783 is a wasteful number, since it uses less digits than its factorization.

1397816783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127074264.

The product of its digits is 1524096, while the sum is 53.

The square root of 1397816783 is about 37387.3880205612. The cubic root of 1397816783 is about 1118.1071298483.

The spelling of 1397816783 in words is "one billion, three hundred ninety-seven million, eight hundred sixteen thousand, seven hundred eighty-three".