1779942438 has 64 divisors (see below), whose sum is σ = 4133744640. Its totient is φ = 574131240.

The previous prime is 1779942433. The next prime is 1779942467. The reversal of 1779942438 is 8342499771.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1779942431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129031 + ... + 142157.

It is an arithmetic number, because the mean of its divisors is an integer number (64589760).

Almost surely, 2^1779942438 is an apocalyptic number.

1779942438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1779942438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2066872320).

1779942438 is an abundant number, since it is smaller than the sum of its proper divisors (2353802202).

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

1779942438 is an equidigital number, since it uses as much as digits as its factorization.

1779942438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13181 (or 13163 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 1779942438 is about 42189.3640388191. The cubic root of 1779942438 is about 1211.9052102125.

The spelling of 1779942438 in words is "one billion, seven hundred seventy-nine million, nine hundred forty-two thousand, four hundred thirty-eight".