13021992 has 96 divisors (see below), whose sum is σ = 38404800. Its totient is φ = 4087584.

The previous prime is 13021927. The next prime is 13021993. The reversal of 13021992 is 29912031.

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

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13021993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77893 + ... + 78059.

It is an arithmetic number, because the mean of its divisors is an integer number (400050).

Almost surely, 2^13021992 is an apocalyptic number.

13021992 is a gapful number since it is divisible by the number (12) 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 13021992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19202400).

13021992 is an abundant number, since it is smaller than the sum of its proper divisors (25382808).

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

13021992 is a wasteful number, since it uses less digits than its factorization.

13021992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 13021992 is about 3608.5997284265. The cubic root of 13021992 is about 235.2659852346.

It can be divided in two parts, 130 and 21992, that added together give a palindrome (22122).

The spelling of 13021992 in words is "thirteen million, twenty-one thousand, nine hundred ninety-two".