1438693444 has 24 divisors (see below), whose sum is σ = 2597987448. Its totient is φ = 696668160.

The previous prime is 1438693439. The next prime is 1438693463. The reversal of 1438693444 is 4443968341.

It can be written as a sum of positive squares in 4 ways, for example, as 279290944 + 1159402500 = 16712^2 + 34050^2 .

It is a super-2 number, since 2×1438693444² = 4139677651617162272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1438693394 and 1438693403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9549 + ... + 54484.

It is an arithmetic number, because the mean of its divisors is an integer number (108249477).

Almost surely, 2^1438693444 is an apocalyptic number.

It is an amenable number.

1438693444 is a deficient number, since it is larger than the sum of its proper divisors (1159294004).

1438693444 is a wasteful number, since it uses less digits than its factorization.

1438693444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64215 (or 64213 counting only the distinct ones).

The product of its digits is 995328, while the sum is 46.

The square root of 1438693444 is about 37930.1126283590. The cubic root of 1438693444 is about 1128.9015990138.

The spelling of 1438693444 in words is "one billion, four hundred thirty-eight million, six hundred ninety-three thousand, four hundred forty-four".