1231845 has 16 divisors (see below), whose sum is σ = 2020032. Its totient is φ = 640640.

The previous prime is 1231843. The next prime is 1231859. The reversal of 1231845 is 5481321.

It is not a de Polignac number, because 1231845 - 2¹ = 1231843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (126252).

2^1231845 is an apocalyptic number.

1231845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231845 is a deficient number, since it is larger than the sum of its proper divisors (788187).

1231845 is a wasteful number, since it uses less digits than its factorization.

1231845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052.

The product of its digits is 960, while the sum is 24.

The square root of 1231845 is about 1109.8851291913. The cubic root of 1231845 is about 107.1976722688.

The spelling of 1231845 in words is "one million, two hundred thirty-one thousand, eight hundred forty-five".