1340218881 has 9 divisors (see below), whose sum is σ = 1936030369. Its totient is φ = 893406036.

The previous prime is 1340218843. The next prime is 1340218909. The reversal of 1340218881 is 1888120431.

The square root of 1340218881 is 36609.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1340218881 - 2¹³ = 1340210689 is a prime.

It is a super-2 number, since 2×1340218881² = 3592373297977784322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340288881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 103726 + ... + 115928.

Almost surely, 2^1340218881 is an apocalyptic number.

1340218881 is the 36609-th square number.

1340218881 is the 18305-th centered octagonal number.

It is an amenable number.

1340218881 is a deficient number, since it is larger than the sum of its proper divisors (595811488).

1340218881 is an frugal number, since it uses more digits than its factorization.

1340218881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24412 (or 12206 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The cubic root of 1340218881 is about 1102.5337956845.

Multiplying 1340218881 by its sum of digits (36), we get a square (48247879716 = 219654²).

The spelling of 1340218881 in words is "one billion, three hundred forty million, two hundred eighteen thousand, eight hundred eighty-one".