1438745640 has 32 divisors (see below), whose sum is σ = 4316237280. Its totient is φ = 383665472.

The previous prime is 1438745617. The next prime is 1438745669. The reversal of 1438745640 is 465478341.

It is a junction number, because it is equal to n+sod(n) for n = 1438745592 and 1438745601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5994654 + ... + 5994893.

It is an arithmetic number, because the mean of its divisors is an integer number (134882415).

Almost surely, 2^1438745640 is an apocalyptic number.

1438745640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438745640 is an abundant number, since it is smaller than the sum of its proper divisors (2877491640).

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

1438745640 is a wasteful number, since it uses less digits than its factorization.

1438745640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11989561 (or 11989557 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 1438745640 is about 37930.8006770224. The cubic root of 1438745640 is about 1128.9152510848.

The spelling of 1438745640 in words is "one billion, four hundred thirty-eight million, seven hundred forty-five thousand, six hundred forty".