1218445934 has 16 divisors (see below), whose sum is σ = 1872858240. Its totient is φ = 594317880.

The previous prime is 1218445931. The next prime is 1218445939. The reversal of 1218445934 is 4395448121.

It is a super-2 number, since 2×1218445934² = 2969220988162264712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1218445891 and 1218445900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218445931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23954 + ... + 54869.

It is an arithmetic number, because the mean of its divisors is an integer number (117053640).

Almost surely, 2^1218445934 is an apocalyptic number.

1218445934 is a deficient number, since it is larger than the sum of its proper divisors (654412306).

1218445934 is a wasteful number, since it uses less digits than its factorization.

1218445934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79015.

The product of its digits is 138240, while the sum is 41.

The square root of 1218445934 is about 34906.2449140551. The cubic root of 1218445934 is about 1068.0758308831.

The spelling of 1218445934 in words is "one billion, two hundred eighteen million, four hundred forty-five thousand, nine hundred thirty-four".