1645150387 has 4 divisors (see below), whose sum is σ = 1664971560. Its totient is φ = 1625329216.

The previous prime is 1645150357. The next prime is 1645150457. The reversal of 1645150387 is 7830515461.

It is a happy number.

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 1645150387 - 2¹¹ = 1645148339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645150337) 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, 9910462 + ... + 9910627.

It is an arithmetic number, because the mean of its divisors is an integer number (416242890).

Almost surely, 2^1645150387 is an apocalyptic number.

1645150387 is a deficient number, since it is larger than the sum of its proper divisors (19821173).

1645150387 is an equidigital number, since it uses as much as digits as its factorization.

1645150387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19821172.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 1645150387 is about 40560.4534861236. The cubic root of 1645150387 is about 1180.5069130586.

The spelling of 1645150387 in words is "one billion, six hundred forty-five million, one hundred fifty thousand, three hundred eighty-seven".