1289155 has 8 divisors (see below), whose sum is σ = 1768032. Its totient is φ = 883968.

The previous prime is 1289153. The next prime is 1289159. The reversal of 1289155 is 5519821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1289155 - 2¹ = 1289153 is a prime.

It is a super-2 number, since 2×1289155² = 3323841228050, which contains 22 as substring.

1289155 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1289153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18382 + ... + 18451.

It is an arithmetic number, because the mean of its divisors is an integer number (221004).

2^1289155 is an apocalyptic number.

1289155 is a deficient number, since it is larger than the sum of its proper divisors (478877).

1289155 is an equidigital number, since it uses as much as digits as its factorization.

1289155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36845.

The product of its digits is 3600, while the sum is 31.

The square root of 1289155 is about 1135.4096177151. The cubic root of 1289155 is about 108.8349492592.

It can be divided in two parts, 1289 and 155, that added together give a square (1444 = 38²).

The spelling of 1289155 in words is "one million, two hundred eighty-nine thousand, one hundred fifty-five".