618769394 has 4 divisors (see below), whose sum is σ = 928154094. Its totient is φ = 309384696.

The previous prime is 618769369. The next prime is 618769397. The reversal of 618769394 is 493967816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 618168769 + 600625 = 24863^2 + 775^2 .

It is a super-2 number, since 2×618769394² = 765751125902254472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (618769397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154692347 + ... + 154692350.

Almost surely, 2^618769394 is an apocalyptic number.

618769394 is a deficient number, since it is larger than the sum of its proper divisors (309384700).

618769394 is a wasteful number, since it uses less digits than its factorization.

618769394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309384699.

The product of its digits is 1959552, while the sum is 53.

The square root of 618769394 is about 24875.0757586786. The cubic root of 618769394 is about 852.1373633286.

The spelling of 618769394 in words is "six hundred eighteen million, seven hundred sixty-nine thousand, three hundred ninety-four".