1221694 has 4 divisors (see below), whose sum is σ = 1832544. Its totient is φ = 610846.

The previous prime is 1221667. The next prime is 1221707. The reversal of 1221694 is 4961221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4961221 = 101 ⋅49121.

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, 305422 + ... + 305425.

It is an arithmetic number, because the mean of its divisors is an integer number (458136).

2^1221694 is an apocalyptic number.

1221694 is a deficient number, since it is larger than the sum of its proper divisors (610850).

1221694 is an equidigital number, since it uses as much as digits as its factorization.

1221694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610849.

The product of its digits is 864, while the sum is 25.

The square root of 1221694 is about 1105.3026734791. The cubic root of 1221694 is about 106.9024061358.

The spelling of 1221694 in words is "one million, two hundred twenty-one thousand, six hundred ninety-four".