1949618873 has 4 divisors (see below), whose sum is σ = 2016847140. Its totient is φ = 1882390608.

The previous prime is 1949618843. The next prime is 1949618903. The reversal of 1949618873 is 3788169491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3788169491 = 1493 ⋅2537287.

It is an interprime number because it is at equal distance from previous prime (1949618843) and next prime (1949618903).

It can be written as a sum of positive squares in 2 ways, for example, as 890246569 + 1059372304 = 29837^2 + 32548^2 .

It is a cyclic number.

It is not a de Polignac number, because 1949618873 - 2¹⁴ = 1949602489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949618843) 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, 33614090 + ... + 33614147.

It is an arithmetic number, because the mean of its divisors is an integer number (504211785).

Almost surely, 2^1949618873 is an apocalyptic number.

It is an amenable number.

1949618873 is a deficient number, since it is larger than the sum of its proper divisors (67228267).

1949618873 is an equidigital number, since it uses as much as digits as its factorization.

1949618873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67228266.

The product of its digits is 2612736, while the sum is 56.

The square root of 1949618873 is about 44154.4887072651. The cubic root of 1949618873 is about 1249.2515782213.

The spelling of 1949618873 in words is "one billion, nine hundred forty-nine million, six hundred eighteen thousand, eight hundred seventy-three".