1225678787 has 8 divisors (see below), whose sum is σ = 1236337200. Its totient is φ = 1215046944.

The previous prime is 1225678777. The next prime is 1225678807. The reversal of 1225678787 is 7878765221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225678787 - 2¹⁶ = 1225613251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225678777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92333 + ... + 104769.

It is an arithmetic number, because the mean of its divisors is an integer number (154542150).

Almost surely, 2^1225678787 is an apocalyptic number.

1225678787 is a deficient number, since it is larger than the sum of its proper divisors (10658413).

1225678787 is a wasteful number, since it uses less digits than its factorization.

1225678787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13285.

The product of its digits is 2634240, while the sum is 53.

The square root of 1225678787 is about 35009.6956142152. The cubic root of 1225678787 is about 1070.1850749825.

The spelling of 1225678787 in words is "one billion, two hundred twenty-five million, six hundred seventy-eight thousand, seven hundred eighty-seven".