2191920 has 40 divisors (see below), whose sum is σ = 6795696. Its totient is φ = 584448.

The previous prime is 2191883. The next prime is 2191949. The reversal of 2191920 is 291912.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4327 + ... + 4806.

2^2191920 is an apocalyptic number.

2191920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191920 is an abundant number, since it is smaller than the sum of its proper divisors (4603776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191920 is a wasteful number, since it uses less digits than its factorization.

2191920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149 (or 9143 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 2191920 is about 1480.5134244579. The cubic root of 2191920 is about 129.8997254352.

The spelling of 2191920 in words is "two million, one hundred ninety-one thousand, nine hundred twenty".