2151804 has 12 divisors (see below), whose sum is σ = 5020904. Its totient is φ = 717264.

The previous prime is 2151791. The next prime is 2151817. The reversal of 2151804 is 4081512.

2151804 = T₆₈₇ + T₆₈₈ + ... + T₆₉₅.

2151804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2151791) and next prime (2151817).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89647 + ... + 89670.

2^2151804 is an apocalyptic number.

It is an amenable number.

2151804 is an abundant number, since it is smaller than the sum of its proper divisors (2869100).

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

2151804 is a wasteful number, since it uses less digits than its factorization.

2151804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179324 (or 179322 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 2151804 is about 1466.9028597695. The cubic root of 2151804 is about 129.1023765158.

The spelling of 2151804 in words is "two million, one hundred fifty-one thousand, eight hundred four".