1863390312 has 64 divisors (see below), whose sum is σ = 5915529600. Its totient is φ = 532396800.

The previous prime is 1863390311. The next prime is 1863390313. The reversal of 1863390312 is 2130933681.

1863390312 is a `hidden beast` number, since 1 + 8 + 6 + 339 + 0 + 312 = 666.

It is an interprime number because it is at equal distance from previous prime (1863390311) and next prime (1863390313).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1863390311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 614689 + ... + 617712.

It is an arithmetic number, because the mean of its divisors is an integer number (92430150).

Almost surely, 2^1863390312 is an apocalyptic number.

1863390312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1863390312 is an abundant number, since it is smaller than the sum of its proper divisors (4052139288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1863390312 is a wasteful number, since it uses less digits than its factorization.

1863390312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232423 (or 1232413 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1863390312 is about 43167.0048995758. The cubic root of 1863390312 is about 1230.5557036887. Note that the first 3 decimals are identical.

The spelling of 1863390312 in words is "one billion, eight hundred sixty-three million, three hundred ninety thousand, three hundred twelve".