1242864 has 100 divisors (see below), whose sum is σ = 4141104. Its totient is φ = 352512.

The previous prime is 1242859. The next prime is 1242869. The reversal of 1242864 is 4682421.

It is an interprime number because it is at equal distance from previous prime (1242859) and next prime (1242869).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242869) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9004 + ... + 9140.

2^1242864 is an apocalyptic number.

1242864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070552).

1242864 is an abundant number, since it is smaller than the sum of its proper divisors (2898240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242864 is a wasteful number, since it uses less digits than its factorization.

1242864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 149 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 1242864 is about 1114.8381048385. The cubic root of 1242864 is about 107.5163559033.

The spelling of 1242864 in words is "one million, two hundred forty-two thousand, eight hundred sixty-four".