1242387 has 24 divisors (see below), whose sum is σ = 1908608. Its totient is φ = 777600.

The previous prime is 1242379. The next prime is 1242403. The reversal of 1242387 is 7832421.

It is not a de Polignac number, because 1242387 - 2³ = 1242379 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

Its product of digits (2688) is a multiple of the sum of its prime divisors (168).

It is a self number, because there is not a number n which added to its sum of digits gives 1242387.

It is not an unprimeable number, because it can be changed into a prime (1242317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16983 + ... + 17055.

2^1242387 is an apocalyptic number.

1242387 is a deficient number, since it is larger than the sum of its proper divisors (666221).

1242387 is a wasteful number, since it uses less digits than its factorization.

1242387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 168 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1242387 is about 1114.6241519005. The cubic root of 1242387 is about 107.5025995405.

It can be divided in two parts, 12423 and 87, that multiplied together give a palindrome (1080801).

The spelling of 1242387 in words is "one million, two hundred forty-two thousand, three hundred eighty-seven".