1213768787 has 12 divisors (see below), whose sum is σ = 1524735408. Its totient is φ = 945793200.

The previous prime is 1213768753. The next prime is 1213768799. The reversal of 1213768787 is 7878673121.

It is a happy number.

It is not a de Polignac number, because 1213768787 - 2²⁶ = 1146659923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213768187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 715664 + ... + 717357.

It is an arithmetic number, because the mean of its divisors is an integer number (127061284).

Almost surely, 2^1213768787 is an apocalyptic number.

1213768787 is a deficient number, since it is larger than the sum of its proper divisors (310966621).

1213768787 is a wasteful number, since it uses less digits than its factorization.

1213768787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433050 (or 1433039 counting only the distinct ones).

The product of its digits is 790272, while the sum is 50.

The square root of 1213768787 is about 34839.1846488979. The cubic root of 1213768787 is about 1066.7074338694.

The spelling of 1213768787 in words is "one billion, two hundred thirteen million, seven hundred sixty-eight thousand, seven hundred eighty-seven".