15801012 has 36 divisors (see below), whose sum is σ = 40543776. Its totient is φ = 5187600.

The previous prime is 15801001. The next prime is 15801017. The reversal of 15801012 is 21010851.

15801012 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15801017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 864 + ... + 5687.

It is an arithmetic number, because the mean of its divisors is an integer number (1126216).

Almost surely, 2^15801012 is an apocalyptic number.

15801012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15801012 is an abundant number, since it is smaller than the sum of its proper divisors (24742764).

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

15801012 is a wasteful number, since it uses less digits than its factorization.

15801012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628 (or 6623 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 15801012 is about 3975.0486789472. The cubic root of 15801012 is about 250.9352277006.

Adding to 15801012 its reverse (21010851), we get a palindrome (36811863).

The spelling of 15801012 in words is "fifteen million, eight hundred one thousand, twelve".