786393997 has 4 divisors (see below), whose sum is σ = 786478140. Its totient is φ = 786309856.

The previous prime is 786393991. The next prime is 786394009. The reversal of 786393997 is 799393687.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 479653801 + 306740196 = 21901^2 + 17514^2 .

It is a cyclic number.

It is not a de Polignac number, because 786393997 - 2¹⁵ = 786361229 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 (786393991) 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, 26008 + ... + 47425.

It is an arithmetic number, because the mean of its divisors is an integer number (196619535).

Almost surely, 2^786393997 is an apocalyptic number.

It is an amenable number.

786393997 is a deficient number, since it is larger than the sum of its proper divisors (84143).

786393997 is a wasteful number, since it uses less digits than its factorization.

786393997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84142.

The product of its digits is 15431472, while the sum is 61.

The square root of 786393997 is about 28042.7173611974. The cubic root of 786393997 is about 923.0248566446.

The spelling of 786393997 in words is "seven hundred eighty-six million, three hundred ninety-three thousand, nine hundred ninety-seven".