2111918 has 4 divisors (see below), whose sum is σ = 3167880. Its totient is φ = 1055958.

The previous prime is 2111917. The next prime is 2111933. The reversal of 2111918 is 8191112.

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

It is a junction number, because it is equal to n+sod(n) for n = 2111893 and 2111902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527978 + ... + 527981.

It is an arithmetic number, because the mean of its divisors is an integer number (791970).

2^2111918 is an apocalyptic number.

2111918 is a deficient number, since it is larger than the sum of its proper divisors (1055962).

2111918 is a wasteful number, since it uses less digits than its factorization.

2111918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055961.

The product of its digits is 144, while the sum is 23.

The square root of 2111918 is about 1453.2439574965. The cubic root of 2111918 is about 128.2997127123.

It can be divided in two parts, 21 and 11918, that multiplied together give a triangular number (250278 = T₇₀₇).

The spelling of 2111918 in words is "two million, one hundred eleven thousand, nine hundred eighteen".