1869121 has 4 divisors (see below), whose sum is σ = 1880752. Its totient is φ = 1857492.

The previous prime is 1869113. The next prime is 1869139. The reversal of 1869121 is 1219681.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1219681 = 79 ⋅15439.

It is a cyclic number.

It is not a de Polignac number, because 1869121 - 2³ = 1869113 is a prime.

It is a super-2 number, since 2×1869121² = 6987226625282, which contains 22 as substring.

It is a Duffinian number.

1869121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1869121.

It is not an unprimeable number, because it can be changed into a prime (1869181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5571 + ... + 5896.

It is an arithmetic number, because the mean of its divisors is an integer number (470188).

2^1869121 is an apocalyptic number.

It is an amenable number.

1869121 is a deficient number, since it is larger than the sum of its proper divisors (11631).

1869121 is a wasteful number, since it uses less digits than its factorization.

1869121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11630.

The product of its digits is 864, while the sum is 28.

The square root of 1869121 is about 1367.1580011103. The cubic root of 1869121 is about 123.1815900205.

The spelling of 1869121 in words is "one million, eight hundred sixty-nine thousand, one hundred twenty-one".