1918949 has 4 divisors (see below), whose sum is σ = 1926060. Its totient is φ = 1911840.

The previous prime is 1918933. The next prime is 1918967. The reversal of 1918949 is 9498191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9498191 = 2801 ⋅3391.

It can be written as a sum of positive squares in 2 ways, for example, as 1170724 + 748225 = 1082^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918949 - 2⁴ = 1918933 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3134 + ... + 3695.

It is an arithmetic number, because the mean of its divisors is an integer number (481515).

2^1918949 is an apocalyptic number.

It is an amenable number.

1918949 is a deficient number, since it is larger than the sum of its proper divisors (7111).

1918949 is an equidigital number, since it uses as much as digits as its factorization.

1918949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110.

The product of its digits is 23328, while the sum is 41.

The square root of 1918949 is about 1385.2613471833. The cubic root of 1918949 is about 124.2666176172.

The spelling of 1918949 in words is "one million, nine hundred eighteen thousand, nine hundred forty-nine".