1231642 has 4 divisors (see below), whose sum is σ = 1847466. Its totient is φ = 615820.

The previous prime is 1231631. The next prime is 1231663. The reversal of 1231642 is 2461321.

1231642 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2461321 = 107 ⋅23003.

It can be written as a sum of positive squares in only one way, i.e., 938961 + 292681 = 969^2 + 541^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307909 + ... + 307912.

2^1231642 is an apocalyptic number.

1231642 is a deficient number, since it is larger than the sum of its proper divisors (615824).

1231642 is an equidigital number, since it uses as much as digits as its factorization.

1231642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615823.

The product of its digits is 288, while the sum is 19.

The square root of 1231642 is about 1109.7936745179. The cubic root of 1231642 is about 107.1917834536.

Adding to 1231642 its reverse (2461321), we get a palindrome (3692963).

The spelling of 1231642 in words is "one million, two hundred thirty-one thousand, six hundred forty-two".