1221902 has 8 divisors (see below), whose sum is σ = 1999512. Its totient is φ = 555400.

The previous prime is 1221863. The next prime is 1221907. The reversal of 1221902 is 2091221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221907) 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, 27749 + ... + 27792.

It is an arithmetic number, because the mean of its divisors is an integer number (249939).

2^1221902 is an apocalyptic number.

1221902 is a deficient number, since it is larger than the sum of its proper divisors (777610).

1221902 is a wasteful number, since it uses less digits than its factorization.

1221902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55554.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1221902 is about 1105.3967613486. The cubic root of 1221902 is about 106.9084726954.

The spelling of 1221902 in words is "one million, two hundred twenty-one thousand, nine hundred two".