1018904749 has 4 divisors (see below), whose sum is σ = 1020600700. Its totient is φ = 1017208800.

The previous prime is 1018904743. The next prime is 1018904767. The reversal of 1018904749 is 9474098101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9474098101 = 13 ⋅728776777.

It can be written as a sum of positive squares in 2 ways, for example, as 372219849 + 646684900 = 19293^2 + 25430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018904749 - 2²³ = 1010516141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018904743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847074 + ... + 848275.

It is an arithmetic number, because the mean of its divisors is an integer number (255150175).

Almost surely, 2^1018904749 is an apocalyptic number.

It is an amenable number.

1018904749 is a deficient number, since it is larger than the sum of its proper divisors (1695951).

1018904749 is an equidigital number, since it uses as much as digits as its factorization.

1018904749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695950.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1018904749 is about 31920.2874203852. The cubic root of 1018904749 is about 1006.2622849265.

The spelling of 1018904749 in words is "one billion, eighteen million, nine hundred four thousand, seven hundred forty-nine".