12815942 has 4 divisors (see below), whose sum is σ = 19223916. Its totient is φ = 6407970.

The previous prime is 12815923. The next prime is 12815969. The reversal of 12815942 is 24951821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24951821 = 41 ⋅608581.

It is a junction number, because it is equal to n+sod(n) for n = 12815899 and 12815908.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3203984 + ... + 3203987.

It is an arithmetic number, because the mean of its divisors is an integer number (4805979).

Almost surely, 2^12815942 is an apocalyptic number.

12815942 is a deficient number, since it is larger than the sum of its proper divisors (6407974).

12815942 is an equidigital number, since it uses as much as digits as its factorization.

12815942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6407973.

The product of its digits is 5760, while the sum is 32.

The square root of 12815942 is about 3579.9360329481. The cubic root of 12815942 is about 234.0184927066.

The spelling of 12815942 in words is "twelve million, eight hundred fifteen thousand, nine hundred forty-two".