1438745641 has 4 divisors (see below), whose sum is σ = 1449247572. Its totient is φ = 1428243712.

The previous prime is 1438745617. The next prime is 1438745669. The reversal of 1438745641 is 1465478341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1465478341 = 19 ⋅77130439.

It can be written as a sum of positive squares in 2 ways, for example, as 962240400 + 476505241 = 31020^2 + 21829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438745641 - 2¹³ = 1438737449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1438746641) 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, 5250760 + ... + 5251033.

It is an arithmetic number, because the mean of its divisors is an integer number (362311893).

Almost surely, 2^1438745641 is an apocalyptic number.

It is an amenable number.

1438745641 is a deficient number, since it is larger than the sum of its proper divisors (10501931).

1438745641 is a wasteful number, since it uses less digits than its factorization.

1438745641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501930.

The product of its digits is 322560, while the sum is 43.

The square root of 1438745641 is about 37930.8006902043. The cubic root of 1438745641 is about 1128.9152513463.

The spelling of 1438745641 in words is "one billion, four hundred thirty-eight million, seven hundred forty-five thousand, six hundred forty-one".