1778393241 has 9 divisors (see below), whose sum is σ = 2568972991. Its totient is φ = 1185511152.

The previous prime is 1778393231. The next prime is 1778393249. The reversal of 1778393241 is 1423938771.

The square root of 1778393241 is 42171.

It is a perfect power (a square), and thus also a powerful number.

1778393241 is a `hidden beast` number, since 17 + 7 + 8 + 393 + 241 = 666.

It can be written as a sum of positive squares in only one way, i.e., 56475225 + 1721918016 = 7515^2 + 41496^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1778393241 - 2¹⁵ = 1778360473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1778393249) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 119485 + ... + 133541.

Almost surely, 2^1778393241 is an apocalyptic number.

1778393241 is the 42171-st square number.

1778393241 is the 21086-th centered octagonal number.

It is an amenable number.

1778393241 is a deficient number, since it is larger than the sum of its proper divisors (790579750).

1778393241 is an frugal number, since it uses more digits than its factorization.

1778393241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28120 (or 14060 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The cubic root of 1778393241 is about 1211.5535087874.

Multiplying 1778393241 by its product of digits (254016), we get a square (451740337505856 = 21254184²).

The spelling of 1778393241 in words is "one billion, seven hundred seventy-eight million, three hundred ninety-three thousand, two hundred forty-one".