1242838 has 4 divisors (see below), whose sum is σ = 1864260. Its totient is φ = 621418.

The previous prime is 1242827. The next prime is 1242841. The reversal of 1242838 is 8382421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8382421 = 29 ⋅289049.

It is a super-3 number, since 3×1242838³ = 5759235333136873416, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 310708 + ... + 310711.

It is an arithmetic number, because the mean of its divisors is an integer number (466065).

2^1242838 is an apocalyptic number.

1242838 is a deficient number, since it is larger than the sum of its proper divisors (621422).

1242838 is an equidigital number, since it uses as much as digits as its factorization.

1242838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621421.

The product of its digits is 3072, while the sum is 28.

The square root of 1242838 is about 1114.8264438916. The cubic root of 1242838 is about 107.5156061713.

It can be divided in two parts, 1242 and 838, that added together give a triangular number (2080 = T₆₄).

The spelling of 1242838 in words is "one million, two hundred forty-two thousand, eight hundred thirty-eight".