1887121 has 4 divisors (see below), whose sum is σ = 1890544. Its totient is φ = 1883700.

The previous prime is 1887113. The next prime is 1887131. The reversal of 1887121 is 1217881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1887121 - 2³ = 1887113 is a prime.

It is a super-2 number, since 2×1887121² = 7122451337282, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1887121.

It is not an unprimeable number, because it can be changed into a prime (1887131) by changing a digit.

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, 675 + ... + 2056.

It is an arithmetic number, because the mean of its divisors is an integer number (472636).

2^1887121 is an apocalyptic number.

It is an amenable number.

1887121 is a deficient number, since it is larger than the sum of its proper divisors (3423).

1887121 is an equidigital number, since it uses as much as digits as its factorization.

1887121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422.

The product of its digits is 896, while the sum is 28.

The square root of 1887121 is about 1373.7252272562. The cubic root of 1887121 is about 123.5757483586.

The spelling of 1887121 in words is "one million, eight hundred eighty-seven thousand, one hundred twenty-one".