1200378987 has 16 divisors (see below), whose sum is σ = 1779732480. Its totient is φ = 799625736.

The previous prime is 1200378983. The next prime is 1200378989. The reversal of 1200378987 is 7898730021.

It is not a de Polignac number, because 1200378987 - 2² = 1200378983 is a prime.

It is a super-2 number, since 2×1200378987² = 2881819424862292338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1200378983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19078 + ... + 52580.

It is an arithmetic number, because the mean of its divisors is an integer number (111233280).

Almost surely, 2^1200378987 is an apocalyptic number.

1200378987 is a deficient number, since it is larger than the sum of its proper divisors (579353493).

1200378987 is a wasteful number, since it uses less digits than its factorization.

1200378987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34839 (or 34833 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1200378987 is about 34646.4859257039. The cubic root of 1200378987 is about 1062.7704279029.

The spelling of 1200378987 in words is "one billion, two hundred million, three hundred seventy-eight thousand, nine hundred eighty-seven".