2158399445 has 8 divisors (see below), whose sum is σ = 2591528280. Its totient is φ = 1725753600.

The previous prime is 2158399429. The next prime is 2158399469. The reversal of 2158399445 is 5449938512.

It can be written as a sum of positive squares in 4 ways, for example, as 242674084 + 1915725361 = 15578^2 + 43769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2158399445 - 2⁴ = 2158399429 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2158399393 and 2158399402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110840 + ... + 128849.

It is an arithmetic number, because the mean of its divisors is an integer number (323941035).

Almost surely, 2^2158399445 is an apocalyptic number.

It is an amenable number.

2158399445 is a deficient number, since it is larger than the sum of its proper divisors (433128835).

2158399445 is a wasteful number, since it uses less digits than its factorization.

2158399445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241495.

The product of its digits is 1555200, while the sum is 50.

The square root of 2158399445 is about 46458.5777332884. The cubic root of 2158399445 is about 1292.3414488996.

The spelling of 2158399445 in words is "two billion, one hundred fifty-eight million, three hundred ninety-nine thousand, four hundred forty-five".