1155969 has 24 divisors (see below), whose sum is σ = 1784640. Its totient is φ = 719712.

The previous prime is 1155967. The next prime is 1155971. The reversal of 1155969 is 9695511.

It is an interprime number because it is at equal distance from previous prime (1155967) and next prime (1155971).

It is not a de Polignac number, because 1155969 - 2¹ = 1155967 is a prime.

It is a super-2 number, since 2×1155969² = 2672528657922, which contains 22 as substring.

1155969 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11172 + ... + 11274.

It is an arithmetic number, because the mean of its divisors is an integer number (74360).

2^1155969 is an apocalyptic number.

It is an amenable number.

1155969 is a deficient number, since it is larger than the sum of its proper divisors (628671).

1155969 is a wasteful number, since it uses less digits than its factorization.

1155969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 178 counting only the distinct ones).

The product of its digits is 12150, while the sum is 36.

The square root of 1155969 is about 1075.1599880948. The cubic root of 1155969 is about 104.9499080794.

It can be divided in two parts, 11559 and 69, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 1155969 in words is "one million, one hundred fifty-five thousand, nine hundred sixty-nine".