1814208157 has 4 divisors (see below), whose sum is σ = 1832170716. Its totient is φ = 1796245600.

The previous prime is 1814208083. The next prime is 1814208163. The reversal of 1814208157 is 7518024181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1701232516 + 112975641 = 41246^2 + 10629^2 .

It is a cyclic number.

It is not a de Polignac number, because 1814208157 - 2¹¹ = 1814206109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1814202157) 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, 8981128 + ... + 8981329.

It is an arithmetic number, because the mean of its divisors is an integer number (458042679).

Almost surely, 2^1814208157 is an apocalyptic number.

It is an amenable number.

1814208157 is a deficient number, since it is larger than the sum of its proper divisors (17962559).

1814208157 is a wasteful number, since it uses less digits than its factorization.

1814208157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17962558.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 1814208157 is about 42593.5224770152. The cubic root of 1814208157 is about 1219.6326397742.

The spelling of 1814208157 in words is "one billion, eight hundred fourteen million, two hundred eight thousand, one hundred fifty-seven".