1418186981 has 4 divisors (see below), whose sum is σ = 1418626464. Its totient is φ = 1417747500.

The previous prime is 1418186963. The next prime is 1418186983. The reversal of 1418186981 is 1896818141.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1418186981 is a prime.

It is a super-2 number, since 2×1418186981² = 4022508626155788722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1418186983) 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, 214865 + ... + 221366.

It is an arithmetic number, because the mean of its divisors is an integer number (354656616).

Almost surely, 2^1418186981 is an apocalyptic number.

It is an amenable number.

1418186981 is a deficient number, since it is larger than the sum of its proper divisors (439483).

1418186981 is an equidigital number, since it uses as much as digits as its factorization.

1418186981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439482.

The product of its digits is 110592, while the sum is 47.

The square root of 1418186981 is about 37658.8234149714. The cubic root of 1418186981 is about 1123.5123001339.

The spelling of 1418186981 in words is "one billion, four hundred eighteen million, one hundred eighty-six thousand, nine hundred eighty-one".