12019815 has 24 divisors (see below), whose sum is σ = 21125520. Its totient is φ = 6321024.

The previous prime is 12019807. The next prime is 12019841. The reversal of 12019815 is 51891021.

It is not a de Polignac number, because 12019815 - 2³ = 12019807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1456 + ... + 5114.

It is an arithmetic number, because the mean of its divisors is an integer number (880230).

Almost surely, 2^12019815 is an apocalyptic number.

12019815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12019815 is a deficient number, since it is larger than the sum of its proper divisors (9105705).

12019815 is a wasteful number, since it uses less digits than its factorization.

12019815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743 (or 3740 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12019815 is about 3466.9604843436. The cubic root of 12019815 is about 229.0687931736.

The spelling of 12019815 in words is "twelve million, nineteen thousand, eight hundred fifteen".