1819779242 has 8 divisors (see below), whose sum is σ = 2736344100. Its totient is φ = 907664544.

The previous prime is 1819779211. The next prime is 1819779253. The reversal of 1819779242 is 2429779181.

It can be written as a sum of positive squares in 2 ways, for example, as 1809736681 + 10042561 = 42541^2 + 3169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1819779242² = 6623192979228189128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111517 + ... + 1113152.

Almost surely, 2^1819779242 is an apocalyptic number.

1819779242 is a deficient number, since it is larger than the sum of its proper divisors (916564858).

1819779242 is a wasteful number, since it uses less digits than its factorization.

1819779242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225080.

The product of its digits is 508032, while the sum is 50.

The square root of 1819779242 is about 42658.8706132734. The cubic root of 1819779242 is about 1220.8797833044.

The spelling of 1819779242 in words is "one billion, eight hundred nineteen million, seven hundred seventy-nine thousand, two hundred forty-two".