1236542 has 4 divisors (see below), whose sum is σ = 1854816. Its totient is φ = 618270.

The previous prime is 1236541. The next prime is 1236553. The reversal of 1236542 is 2456321.

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

It is a super-2 number, since 2×1236542² = 3058072235528, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1236541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309134 + ... + 309137.

It is an arithmetic number, because the mean of its divisors is an integer number (463704).

2^1236542 is an apocalyptic number.

1236542 is a deficient number, since it is larger than the sum of its proper divisors (618274).

1236542 is an equidigital number, since it uses as much as digits as its factorization.

1236542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618273.

The product of its digits is 1440, while the sum is 23.

The square root of 1236542 is about 1111.9991007191. Note that the first 3 decimals coincide. The cubic root of 1236542 is about 107.3337469818. Note that the first 3 decimals are identical.

The spelling of 1236542 in words is "one million, two hundred thirty-six thousand, five hundred forty-two".