1918465849 has 4 divisors (see below), whose sum is σ = 1924158964. Its totient is φ = 1912772736.

The previous prime is 1918465831. The next prime is 1918465867. The reversal of 1918465849 is 9485648191.

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

It is an interprime number because it is at equal distance from previous prime (1918465831) and next prime (1918465867).

It can be written as a sum of positive squares in 2 ways, for example, as 425184400 + 1493281449 = 20620^2 + 38643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918465849 - 2⁵ = 1918465817 is a prime.

It is a super-2 number, since 2×1918465849² = 7361022427558581602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1918465849.

It is not an unprimeable number, because it can be changed into a prime (1918465049) 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, 2846052 + ... + 2846725.

It is an arithmetic number, because the mean of its divisors is an integer number (481039741).

Almost surely, 2^1918465849 is an apocalyptic number.

It is an amenable number.

1918465849 is a deficient number, since it is larger than the sum of its proper divisors (5693115).

1918465849 is an equidigital number, since it uses as much as digits as its factorization.

1918465849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5693114.

The product of its digits is 2488320, while the sum is 55.

The square root of 1918465849 is about 43800.2950789147. The cubic root of 1918465849 is about 1242.5618750149.

The spelling of 1918465849 in words is "one billion, nine hundred eighteen million, four hundred sixty-five thousand, eight hundred forty-nine".