1318786420 has 72 divisors (see below), whose sum is σ = 3308868864. Its totient is φ = 432472128.

The previous prime is 1318786387. The next prime is 1318786471. The reversal of 1318786420 is 246878131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65157 + ... + 82963.

It is an arithmetic number, because the mean of its divisors is an integer number (45956512).

Almost surely, 2^1318786420 is an apocalyptic number.

1318786420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1318786420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654434432).

1318786420 is an abundant number, since it is smaller than the sum of its proper divisors (1990082444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1318786420 is a wasteful number, since it uses less digits than its factorization.

1318786420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17869 (or 17844 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1318786420 is about 36315.0990636126. The cubic root of 1318786420 is about 1096.6250330900.

The spelling of 1318786420 in words is "one billion, three hundred eighteen million, seven hundred eighty-six thousand, four hundred twenty".