1361889 has 9 divisors (see below), whose sum is σ = 1972243.
Its totient is φ = 905592.
The previous prime is 1361879. The next prime is 1361903. The reversal of 1361889 is 9881631.
Multipling 1361889 by its sum of digits (36), we get a square (49028004 = 70022).
It can be divided in two parts, 136 and 1889, that added together give a square (2025 = 452).
The square root of 1361889 is 1167.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 321489 + 1040400 = 567^2 + 1020^2
It is a tau number, because it is divible by the number of its divisors (9).
It is not a de Polignac number, because 1361889 - 219 = 837601 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (1361809) 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 8 ways as a sum of consecutive naturals, for example, 3307 + ... + 3695.
21361889 is an apocalyptic number.
1361889 is the 1167-th square number.
1361889 is the 584-th centered octagonal number.
It is an amenable number.
1361889 is a deficient number, since it is larger than the sum of its proper divisors (610354).
1361889 is an frugal number, since it uses more digits than its factorization.
1361889 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 784 (or 392 counting only the distinct ones).
The product of its digits is 10368, while the sum is 36.
The cubic root of 1361889 is about 110.8444375530.
The spelling of 1361889 in words is "one million, three hundred sixty-one thousand, eight hundred eighty-nine".