1812893438 has 8 divisors (see below), whose sum is σ = 2720670888. Its totient is φ = 906003144.

The previous prime is 1812893429. The next prime is 1812893473. The reversal of 1812893438 is 8343982181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1812893392 and 1812893401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216656 + ... + 224867.

It is an arithmetic number, because the mean of its divisors is an integer number (340083861).

Almost surely, 2^1812893438 is an apocalyptic number.

1812893438 is a deficient number, since it is larger than the sum of its proper divisors (907777450).

1812893438 is a wasteful number, since it uses less digits than its factorization.

1812893438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443578.

The product of its digits is 331776, while the sum is 47.

The square root of 1812893438 is about 42578.0863590650. The cubic root of 1812893438 is about 1219.3379544245.

The spelling of 1812893438 in words is "one billion, eight hundred twelve million, eight hundred ninety-three thousand, four hundred thirty-eight".