1778994 has 36 divisors (see below), whose sum is σ = 4486014. Its totient is φ = 508032.

The previous prime is 1778993. The next prime is 1779007. The reversal of 1778994 is 4998771.

1778994 = 71² + 72² + ... + 178².

It can be written as a sum of positive squares in only one way, i.e., 1238769 + 540225 = 1113^2 + 735^2 .

It is not an unprimeable number, because it can be changed into a prime (1778993) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 127 + ... + 1890.

2^1778994 is an apocalyptic number.

1778994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243007).

1778994 is an abundant number, since it is smaller than the sum of its proper divisors (2707020).

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

1778994 is a wasteful number, since it uses less digits than its factorization.

1778994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039 (or 2029 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1778994 is about 1333.7893386888. The cubic root of 1778994 is about 121.1689918387.

It can be divided in two parts, 1778 and 994, that added together give a palindrome (2772).

The spelling of 1778994 in words is "one million, seven hundred seventy-eight thousand, nine hundred ninety-four".