2091400 has 24 divisors (see below), whose sum is σ = 4862970. Its totient is φ = 836480.

The previous prime is 2091389. The next prime is 2091409. The reversal of 2091400 is 41902.

It can be written as a sum of positive squares in 3 ways, for example, as 1909924 + 181476 = 1382^2 + 426^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2091409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5029 + ... + 5428.

2^2091400 is an apocalyptic number.

2091400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2091400 is an abundant number, since it is smaller than the sum of its proper divisors (2771570).

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

2091400 is a wasteful number, since it uses less digits than its factorization.

2091400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10473 (or 10464 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2091400 is about 1446.1673485458. The cubic root of 2091400 is about 127.8828681065.

The spelling of 2091400 in words is "two million, ninety-one thousand, four hundred".