618919749 has 12 divisors (see below), whose sum is σ = 1021708896. Its totient is φ = 353668392.

The previous prime is 618919747. The next prime is 618919751. The reversal of 618919749 is 947919816.

618919749 is a `hidden beast` number, since 618 + 9 + 19 + 7 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (618919747) and next prime (618919751).

It is not a de Polignac number, because 618919749 - 2¹ = 618919747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 618919695 and 618919704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618919747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4911999 + ... + 4912124.

It is an arithmetic number, because the mean of its divisors is an integer number (85142408).

Almost surely, 2^618919749 is an apocalyptic number.

It is an amenable number.

618919749 is a deficient number, since it is larger than the sum of its proper divisors (402789147).

618919749 is a wasteful number, since it uses less digits than its factorization.

618919749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9824136 (or 9824133 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 618919749 is about 24878.0977769604. The cubic root of 618919749 is about 852.2063781282.

The spelling of 618919749 in words is "six hundred eighteen million, nine hundred nineteen thousand, seven hundred forty-nine".