1438197620 has 24 divisors (see below), whose sum is σ = 3197875464. Its totient is φ = 541438976.

The previous prime is 1438197611. The next prime is 1438197623. The reversal of 1438197620 is 267918341.

It can be written as a sum of positive squares in 4 ways, for example, as 42876304 + 1395321316 = 6548^2 + 37354^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438197623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2114657 + ... + 2115336.

It is an arithmetic number, because the mean of its divisors is an integer number (133244811).

Almost surely, 2^1438197620 is an apocalyptic number.

1438197620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438197620 is an abundant number, since it is smaller than the sum of its proper divisors (1759677844).

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

1438197620 is a wasteful number, since it uses less digits than its factorization.

1438197620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230019 (or 4230017 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1438197620 is about 37923.5760444608. The cubic root of 1438197620 is about 1128.7718978087.

The spelling of 1438197620 in words is "one billion, four hundred thirty-eight million, one hundred ninety-seven thousand, six hundred twenty".