1023155440 has 80 divisors (see below), whose sum is σ = 2452718016. Its totient is φ = 396748800.

The previous prime is 1023155431. The next prime is 1023155461. The reversal of 1023155440 is 445513201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345004 + ... + 347956.

Almost surely, 2^1023155440 is an apocalyptic number.

1023155440 is a gapful number since it is divisible by the number (10) 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 1023155440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226359008).

1023155440 is an abundant number, since it is smaller than the sum of its proper divisors (1429562576).

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

1023155440 is a wasteful number, since it uses less digits than its factorization.

1023155440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098 (or 3092 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1023155440 is about 31986.8010279240. The cubic root of 1023155440 is about 1007.6596598131.

Adding to 1023155440 its reverse (445513201), we get a palindrome (1468668641).

The spelling of 1023155440 in words is "one billion, twenty-three million, one hundred fifty-five thousand, four hundred forty".