1023111642 has 128 divisors (see below), whose sum is σ = 2507839488. Its totient is φ = 272160000.

The previous prime is 1023111613. The next prime is 1023111643. The reversal of 1023111642 is 2461113201.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1023111643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4076017 + ... + 4076267.

It is an arithmetic number, because the mean of its divisors is an integer number (19592496).

Almost surely, 2^1023111642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1023111642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253919744).

1023111642 is an abundant number, since it is smaller than the sum of its proper divisors (1484727846).

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

1023111642 is a wasteful number, since it uses less digits than its factorization.

1023111642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

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

The square root of 1023111642 is about 31986.1163944609. The cubic root of 1023111642 is about 1007.6452813828.

Adding to 1023111642 its reverse (2461113201), we get a palindrome (3484224843).

The spelling of 1023111642 in words is "one billion, twenty-three million, one hundred eleven thousand, six hundred forty-two".