1023642 has 48 divisors (see below), whose sum is σ = 2400840. Its totient is φ = 314496.

The previous prime is 1023601. The next prime is 1023643. The reversal of 1023642 is 2463201.

It is a happy number.

1023642 is a `hidden beast` number, since 1 + 0 + 23 + 642 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1022121 + 1521 = 1011^2 + 39^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1023643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19288 + ... + 19340.

2^1023642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1023642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1200420).

1023642 is an abundant number, since it is smaller than the sum of its proper divisors (1377198).

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

1023642 is a wasteful number, since it uses less digits than its factorization.

1023642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1023642 is about 1011.7519458840. The cubic root of 1023642 is about 100.7819364835.

Adding to 1023642 its reverse (2463201), we get a palindrome (3486843).

The spelling of 1023642 in words is "one million, twenty-three thousand, six hundred forty-two".