1391141818 has 32 divisors (see below), whose sum is σ = 2297108160. Its totient is φ = 626616960.

The previous prime is 1391141809. The next prime is 1391141819. The reversal of 1391141818 is 8181411931.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1391141819) 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 15 ways as a sum of consecutive naturals, for example, 1799280 + ... + 1800052.

It is an arithmetic number, because the mean of its divisors is an integer number (71784630).

Almost surely, 2^1391141818 is an apocalyptic number.

1391141818 is a deficient number, since it is larger than the sum of its proper divisors (905966342).

1391141818 is a wasteful number, since it uses less digits than its factorization.

1391141818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422.

The product of its digits is 6912, while the sum is 37.

The square root of 1391141818 is about 37298.0135932197. The cubic root of 1391141818 is about 1116.3245315643.

It can be divided in two parts, 139114 and 1818, that multiplied together give a palindrome (252909252).

The spelling of 1391141818 in words is "one billion, three hundred ninety-one million, one hundred forty-one thousand, eight hundred eighteen".