1340907818 has 4 divisors (see below), whose sum is σ = 2011361730. Its totient is φ = 670453908.

The previous prime is 1340907817. The next prime is 1340907823. The reversal of 1340907818 is 8187090431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1080634129 + 260273689 = 32873^2 + 16133^2 .

It is a super-2 number, since 2×1340907818² = 3596067552747042248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1340907817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335226953 + ... + 335226956.

Almost surely, 2^1340907818 is an apocalyptic number.

1340907818 is a deficient number, since it is larger than the sum of its proper divisors (670453912).

1340907818 is an equidigital number, since it uses as much as digits as its factorization.

1340907818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670453911.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 1340907818 is about 36618.4081849553. The cubic root of 1340907818 is about 1102.7226817987.

The spelling of 1340907818 in words is "one billion, three hundred forty million, nine hundred seven thousand, eight hundred eighteen".