1918971 has 24 divisors (see below), whose sum is σ = 2948400. Its totient is φ = 1246752.

The previous prime is 1918967. The next prime is 1918979. The reversal of 1918971 is 1798191.

It is not a de Polignac number, because 1918971 - 2² = 1918967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1918979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12805 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2^1918971 is an apocalyptic number.

1918971 is a deficient number, since it is larger than the sum of its proper divisors (1029429).

1918971 is an equidigital number, since it uses as much as digits as its factorization.

1918971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 205 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 1918971 is about 1385.2692879004. The cubic root of 1918971 is about 124.2670925047.

The spelling of 1918971 in words is "one million, nine hundred eighteen thousand, nine hundred seventy-one".