1242921 has 8 divisors (see below), whose sum is σ = 1754784. Its totient is φ = 779840.

The previous prime is 1242893. The next prime is 1242929. The reversal of 1242921 is 1292421.

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

It is a cyclic number.

It is not a de Polignac number, because 1242921 - 2⁵ = 1242889 is a prime.

It is a super-2 number, since 2×1242921² = 3089705224482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1242929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12135 + ... + 12236.

It is an arithmetic number, because the mean of its divisors is an integer number (219348).

2^1242921 is an apocalyptic number.

It is an amenable number.

1242921 is a deficient number, since it is larger than the sum of its proper divisors (511863).

1242921 is a wasteful number, since it uses less digits than its factorization.

1242921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24391.

The product of its digits is 288, while the sum is 21.

The square root of 1242921 is about 1114.8636687954. The cubic root of 1242921 is about 107.5179995099.

The spelling of 1242921 in words is "one million, two hundred forty-two thousand, nine hundred twenty-one".