1121658 has 16 divisors (see below), whose sum is σ = 2275776. Its totient is φ = 368480.

The previous prime is 1121651. The next prime is 1121671. The reversal of 1121658 is 8561211.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1121651) 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 7 ways as a sum of consecutive naturals, for example, 891 + ... + 1742.

It is an arithmetic number, because the mean of its divisors is an integer number (142236).

2^1121658 is an apocalyptic number.

1121658 is an abundant number, since it is smaller than the sum of its proper divisors (1154118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121658 is a wasteful number, since it uses less digits than its factorization.

1121658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709.

The product of its digits is 480, while the sum is 24.

The square root of 1121658 is about 1059.0835661080. The cubic root of 1121658 is about 103.9011017424.

Adding to 1121658 its reverse (8561211), we get a palindrome (9682869).

It can be divided in two parts, 112 and 1658, that added together give a triangular number (1770 = T₅₉).

The spelling of 1121658 in words is "one million, one hundred twenty-one thousand, six hundred fifty-eight".