1210880387 has 4 divisors (see below), whose sum is σ = 1239040440. Its totient is φ = 1182720336.

The previous prime is 1210880383. The next prime is 1210880417. The reversal of 1210880387 is 7830880121.

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 1210880387 - 2² = 1210880383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210880387.

It is not an unprimeable number, because it can be changed into a prime (1210880381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14079962 + ... + 14080047.

It is an arithmetic number, because the mean of its divisors is an integer number (309760110).

Almost surely, 2^1210880387 is an apocalyptic number.

1210880387 is a deficient number, since it is larger than the sum of its proper divisors (28160053).

1210880387 is an equidigital number, since it uses as much as digits as its factorization.

1210880387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28160052.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 1210880387 is about 34797.7066342022. The cubic root of 1210880387 is about 1065.8606155324.

The spelling of 1210880387 in words is "one billion, two hundred ten million, eight hundred eighty thousand, three hundred eighty-seven".