1308638420 has 18 divisors (see below), whose sum is σ = 2748480462. Its totient is φ = 523390656.

The previous prime is 1308638399. The next prime is 1308638453. The reversal of 1308638420 is 248368031.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 156850576 + 1151787844 = 12524^2 + 33938^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157736 + ... + 165824.

It is an arithmetic number, because the mean of its divisors is an integer number (152693359).

Almost surely, 2^1308638420 is an apocalyptic number.

1308638420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1308638420 is an abundant number, since it is smaller than the sum of its proper divisors (1439842042).

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

1308638420 is an frugal number, since it uses more digits than its factorization.

1308638420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16187 (or 8096 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1308638420 is about 36175.1077399916. The cubic root of 1308638420 is about 1093.8049610694.

The spelling of 1308638420 in words is "one billion, three hundred eight million, six hundred thirty-eight thousand, four hundred twenty".