1185921 has 25 divisors (see below), whose sum is σ = 1948705. Its totient is φ = 718740.

The previous prime is 1185907. The next prime is 1185929. The reversal of 1185921 is 1295811.

The square root of 1185921 is 1089.

It is a perfect power (a square, a biquadrate), and thus also a powerful number.

It is not a de Polignac number, because 1185921 - 2⁵ = 1185889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1185929) by changing a digit.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 107806 + ... + 107816.

2^1185921 is an apocalyptic number.

1185921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1185921 is the 1089-th square number.

1185921 is the 545-th centered octagonal number.

It is an amenable number.

1185921 is a deficient number, since it is larger than the sum of its proper divisors (762784).

1185921 is an frugal number, since it uses more digits than its factorization.

1185921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 14 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The cubic root of 1185921 is about 105.8486328899.

The spelling of 1185921 in words is "one million, one hundred eighty-five thousand, nine hundred twenty-one".