1225863887 has 4 divisors (see below), whose sum is σ = 1229064960. Its totient is φ = 1222662816.

The previous prime is 1225863851. The next prime is 1225863923. The reversal of 1225863887 is 7883685221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7883685221 = 163 ⋅48366167.

It is an interprime number because it is at equal distance from previous prime (1225863851) and next prime (1225863923).

It is a cyclic number.

It is not a de Polignac number, because 1225863887 - 2⁸ = 1225863631 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 (1225860887) 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, 1599962 + ... + 1600727.

It is an arithmetic number, because the mean of its divisors is an integer number (307266240).

Almost surely, 2^1225863887 is an apocalyptic number.

1225863887 is a deficient number, since it is larger than the sum of its proper divisors (3201073).

1225863887 is an equidigital number, since it uses as much as digits as its factorization.

1225863887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201072.

The product of its digits is 1290240, while the sum is 50.

The square root of 1225863887 is about 35012.3390678201. The cubic root of 1225863887 is about 1070.2389448024.

The spelling of 1225863887 in words is "one billion, two hundred twenty-five million, eight hundred sixty-three thousand, eight hundred eighty-seven".