1242391 has 8 divisors (see below), whose sum is σ = 1365120. Its totient is φ = 1125432.

The previous prime is 1242379. The next prime is 1242403. The reversal of 1242391 is 1932421.

It is an interprime number because it is at equal distance from previous prime (1242379) and next prime (1242403).

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 1242391 - 2⁵ = 1242359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242361) 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, 985 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (170640).

2^1242391 is an apocalyptic number.

1242391 is a deficient number, since it is larger than the sum of its proper divisors (122729).

1242391 is a wasteful number, since it uses less digits than its factorization.

1242391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885.

The product of its digits is 432, while the sum is 22.

The square root of 1242391 is about 1114.6259462259. The cubic root of 1242391 is about 107.5027149125.

The spelling of 1242391 in words is "one million, two hundred forty-two thousand, three hundred ninety-one".