1221634 has 4 divisors (see below), whose sum is σ = 1832454. Its totient is φ = 610816.

The previous prime is 1221631. The next prime is 1221641. The reversal of 1221634 is 4361221.

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

It can be written as a sum of positive squares in only one way, i.e., 1203409 + 18225 = 1097^2 + 135^2 .

It is not an unprimeable number, because it can be changed into a prime (1221631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305407 + ... + 305410.

2^1221634 is an apocalyptic number.

1221634 is a deficient number, since it is larger than the sum of its proper divisors (610820).

1221634 is an equidigital number, since it uses as much as digits as its factorization.

1221634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610819.

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

The square root of 1221634 is about 1105.2755312591. The cubic root of 1221634 is about 106.9006560387.

Adding to 1221634 its reverse (4361221), we get a palindrome (5582855).

The spelling of 1221634 in words is "one million, two hundred twenty-one thousand, six hundred thirty-four".