1018697399 has 4 divisors (see below), whose sum is σ = 1019188536. Its totient is φ = 1018206264.

The previous prime is 1018697359. The next prime is 1018697423. The reversal of 1018697399 is 9937968101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9937968101 = 3061 ⋅3246641.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1018697399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1018697399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018697359) 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 3 ways as a sum of consecutive naturals, for example, 242444 + ... + 246609.

It is an arithmetic number, because the mean of its divisors is an integer number (254797134).

Almost surely, 2^1018697399 is an apocalyptic number.

1018697399 is a deficient number, since it is larger than the sum of its proper divisors (491137).

1018697399 is an equidigital number, since it uses as much as digits as its factorization.

1018697399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491136.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1018697399 is about 31917.0393207139. The cubic root of 1018697399 is about 1006.1940212214.

The spelling of 1018697399 in words is "one billion, eighteen million, six hundred ninety-seven thousand, three hundred ninety-nine".