1218840361 has 8 divisors (see below), whose sum is σ = 1274086400. Its totient is φ = 1164589920.

The previous prime is 1218840353. The next prime is 1218840409. The reversal of 1218840361 is 1630488121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1218840361 - 2³ = 1218840353 is a prime.

It is a super-2 number, since 2×1218840361² = 2971143651205220642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218840061) 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, 246396 + ... + 251293.

It is an arithmetic number, because the mean of its divisors is an integer number (159260800).

Almost surely, 2^1218840361 is an apocalyptic number.

It is an amenable number.

1218840361 is a deficient number, since it is larger than the sum of its proper divisors (55246039).

1218840361 is an equidigital number, since it uses as much as digits as its factorization.

1218840361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497799.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1218840361 is about 34911.8942625576. The cubic root of 1218840361 is about 1068.1910685216.

The spelling of 1218840361 in words is "one billion, two hundred eighteen million, eight hundred forty thousand, three hundred sixty-one".