1438054778 has 4 divisors (see below), whose sum is σ = 2157082170. Its totient is φ = 719027388.

The previous prime is 1438054771. The next prime is 1438054801. The reversal of 1438054778 is 8774508341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8774508341 = 22727 ⋅386083.

It can be written as a sum of positive squares in only one way, i.e., 1210135369 + 227919409 = 34787^2 + 15097^2 .

It is not an unprimeable number, because it can be changed into a prime (1438054771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359513693 + ... + 359513696.

Almost surely, 2^1438054778 is an apocalyptic number.

1438054778 is a deficient number, since it is larger than the sum of its proper divisors (719027392).

1438054778 is an equidigital number, since it uses as much as digits as its factorization.

1438054778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719027391.

The product of its (nonzero) digits is 752640, while the sum is 47.

The square root of 1438054778 is about 37921.6927101099. The cubic root of 1438054778 is about 1128.7345266409.

The spelling of 1438054778 in words is "one billion, four hundred thirty-eight million, fifty-four thousand, seven hundred seventy-eight".