1318720427 has 4 divisors (see below), whose sum is σ = 1319162856. Its totient is φ = 1318278000.

The previous prime is 1318720397. The next prime is 1318720457. The reversal of 1318720427 is 7240278131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7240278131 = 8059 ⋅898409.

It is an interprime number because it is at equal distance from previous prime (1318720397) and next prime (1318720457).

It is a cyclic number.

It is not a de Polignac number, because 1318720427 - 2⁶ = 1318720363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318720457) 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, 216713 + ... + 222714.

It is an arithmetic number, because the mean of its divisors is an integer number (329790714).

Almost surely, 2^1318720427 is an apocalyptic number.

1318720427 is a deficient number, since it is larger than the sum of its proper divisors (442429).

1318720427 is an equidigital number, since it uses as much as digits as its factorization.

1318720427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442428.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 1318720427 is about 36314.1904356961. The cubic root of 1318720427 is about 1096.6067408223.

Adding to 1318720427 its reverse (7240278131), we get a palindrome (8558998558).

The spelling of 1318720427 in words is "one billion, three hundred eighteen million, seven hundred twenty thousand, four hundred twenty-seven".