1213642 has 8 divisors (see below), whose sum is σ = 1828800. Its totient is φ = 604044.

The previous prime is 1213633. The next prime is 1213643. The reversal of 1213642 is 2463121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1213643) 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, 792 + ... + 1747.

It is an arithmetic number, because the mean of its divisors is an integer number (228600).

2^1213642 is an apocalyptic number.

1213642 is a deficient number, since it is larger than the sum of its proper divisors (615158).

1213642 is a wasteful number, since it uses less digits than its factorization.

1213642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780.

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

The square root of 1213642 is about 1101.6542107213. The cubic root of 1213642 is about 106.6670290786.

Adding to 1213642 its reverse (2463121), we get a palindrome (3676763).

The spelling of 1213642 in words is "one million, two hundred thirteen thousand, six hundred forty-two".