1220542 has 4 divisors (see below), whose sum is σ = 1830816. Its totient is φ = 610270.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220542 is 2450221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2450221 = 19 ⋅128959.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305134 + ... + 305137.

It is an arithmetic number, because the mean of its divisors is an integer number (457704).

2^1220542 is an apocalyptic number.

1220542 is a deficient number, since it is larger than the sum of its proper divisors (610274).

1220542 is an equidigital number, since it uses as much as digits as its factorization.

1220542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610273.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1220542 is about 1104.7814263464. The cubic root of 1220542 is about 106.8687942545.

Adding to 1220542 its reverse (2450221), we get a palindrome (3670763).

The spelling of 1220542 in words is "one million, two hundred twenty thousand, five hundred forty-two".