1918344257 has 4 divisors (see below), whose sum is σ = 1936272816. Its totient is φ = 1900415700.

The previous prime is 1918344199. The next prime is 1918344283. The reversal of 1918344257 is 7524438191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1918344257 - 2¹⁰ = 1918343233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918344457) 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, 8964119 + ... + 8964332.

It is an arithmetic number, because the mean of its divisors is an integer number (484068204).

Almost surely, 2^1918344257 is an apocalyptic number.

It is an amenable number.

1918344257 is a deficient number, since it is larger than the sum of its proper divisors (17928559).

1918344257 is a wasteful number, since it uses less digits than its factorization.

1918344257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17928558.

The product of its digits is 241920, while the sum is 44.

The square root of 1918344257 is about 43798.9070297422. The cubic root of 1918344257 is about 1242.5356233486.

The spelling of 1918344257 in words is "one billion, nine hundred eighteen million, three hundred forty-four thousand, two hundred fifty-seven".