816378903 has 12 divisors (see below), whose sum is σ = 1183414128. Its totient is φ = 542314080.

The previous prime is 816378883. The next prime is 816378911. The reversal of 816378903 is 309873618.

It is a happy number.

816378903 is a `hidden beast` number, since 8 + 1 + 637 + 8 + 9 + 0 + 3 = 666.

It is not a de Polignac number, because 816378903 - 2¹⁸ = 816116759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816378923) 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, 158875 + ... + 163932.

It is an arithmetic number, because the mean of its divisors is an integer number (98617844).

Almost surely, 2^816378903 is an apocalyptic number.

816378903 is a deficient number, since it is larger than the sum of its proper divisors (367035225).

816378903 is a wasteful number, since it uses less digits than its factorization.

816378903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323094 (or 323091 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 816378903 is about 28572.3450735147. The cubic root of 816378903 is about 934.6103604934.

It can be divided in two parts, 816378 and 903, that added together give a triangular number (817281 = T₁₂₇₈).

The spelling of 816378903 in words is "eight hundred sixteen million, three hundred seventy-eight thousand, nine hundred three".