1645830387 has 16 divisors (see below), whose sum is σ = 2439365280. Its totient is φ = 1096726176.

The previous prime is 1645830379. The next prime is 1645830413. The reversal of 1645830387 is 7830385461.

1645830387 is a `hidden beast` number, since 1 + 64 + 583 + 0 + 3 + 8 + 7 = 666.

It is not a de Polignac number, because 1645830387 - 2³ = 1645830379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645830887) 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, 53293 + ... + 78305.

It is an arithmetic number, because the mean of its divisors is an integer number (152460330).

Almost surely, 2^1645830387 is an apocalyptic number.

1645830387 is a deficient number, since it is larger than the sum of its proper divisors (793534893).

1645830387 is a wasteful number, since it uses less digits than its factorization.

1645830387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27459 (or 27453 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1645830387 is about 40568.8351693760. The cubic root of 1645830387 is about 1180.6695393513.

The spelling of 1645830387 in words is "one billion, six hundred forty-five million, eight hundred thirty thousand, three hundred eighty-seven".