1231849 has 4 divisors (see below), whose sum is σ = 1245780. Its totient is φ = 1217920.

The previous prime is 1231843. The next prime is 1231859. The reversal of 1231849 is 9481321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 310249 + 921600 = 557^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231849 - 2⁵ = 1231817 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6832 + ... + 7009.

It is an arithmetic number, because the mean of its divisors is an integer number (311445).

2^1231849 is an apocalyptic number.

It is an amenable number.

1231849 is a deficient number, since it is larger than the sum of its proper divisors (13931).

1231849 is an equidigital number, since it uses as much as digits as its factorization.

1231849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13930.

The product of its digits is 1728, while the sum is 28.

The square root of 1231849 is about 1109.8869311781. The cubic root of 1231849 is about 107.1977882981.

It can be divided in two parts, 1231 and 849, that added together give a triangular number (2080 = T₆₄).

The spelling of 1231849 in words is "one million, two hundred thirty-one thousand, eight hundred forty-nine".