1778742 has 48 divisors (see below), whose sum is σ = 4642560. Its totient is φ = 480816.

The previous prime is 1778731. The next prime is 1778743. The reversal of 1778742 is 2478771.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 1 + 7 + 7⁷ + 8³ + 7⁷ + 4³ + 2¹⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 1778697 and 1778706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2023 + ... + 2765.

It is an arithmetic number, because the mean of its divisors is an integer number (96720).

2^1778742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2321280).

1778742 is an abundant number, since it is smaller than the sum of its proper divisors (2863818).

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

1778742 is a wasteful number, since it uses less digits than its factorization.

1778742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 774 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 1778742 is about 1333.6948676515. The cubic root of 1778742 is about 121.1632702478.

The spelling of 1778742 in words is "one million, seven hundred seventy-eight thousand, seven hundred forty-two".