1778813406 has 64 divisors (see below), whose sum is σ = 4077077760. Its totient is φ = 574452000.

The previous prime is 1778813357. The next prime is 1778813423. The reversal of 1778813406 is 6043188771.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499725 + ... + 503271.

It is an arithmetic number, because the mean of its divisors is an integer number (63704340).

Almost surely, 2^1778813406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778813406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038538880).

1778813406 is an abundant number, since it is smaller than the sum of its proper divisors (2298264354).

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

1778813406 is a wasteful number, since it uses less digits than its factorization.

1778813406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846 (or 3840 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 1778813406 is about 42175.9813875149. The cubic root of 1778813406 is about 1211.6489155631.

The spelling of 1778813406 in words is "one billion, seven hundred seventy-eight million, eight hundred thirteen thousand, four hundred six".