1001263120 has 80 divisors (see below), whose sum is σ = 2734949952. Its totient is φ = 336084480.

The previous prime is 1001263097. The next prime is 1001263129. The reversal of 1001263120 is 213621001.

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

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1001263094 and 1001263103.

It is not an unprimeable number, because it can be changed into a prime (1001263129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32322 + ... + 55201.

Almost surely, 2^1001263120 is an apocalyptic number.

1001263120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001263120 is an abundant number, since it is smaller than the sum of its proper divisors (1733686832).

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

1001263120 is a wasteful number, since it uses less digits than its factorization.

1001263120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87560 (or 87554 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1001263120 is about 31642.7419797969. The cubic root of 1001263120 is about 1000.4208628496.

Adding to 1001263120 its reverse (213621001), we get a palindrome (1214884121).

The spelling of 1001263120 in words is "one billion, one million, two hundred sixty-three thousand, one hundred twenty".