1438378 has 4 divisors (see below), whose sum is σ = 2157570. Its totient is φ = 719188.

The previous prime is 1438303. The next prime is 1438379. The reversal of 1438378 is 8738341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8738341 = 67 ⋅130423.

It can be written as a sum of positive squares in only one way, i.e., 1423249 + 15129 = 1193^2 + 123^2 .

It is not an unprimeable number, because it can be changed into a prime (1438379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359593 + ... + 359596.

2^1438378 is an apocalyptic number.

1438378 is a deficient number, since it is larger than the sum of its proper divisors (719192).

1438378 is an equidigital number, since it uses as much as digits as its factorization.

1438378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719191.

The product of its digits is 16128, while the sum is 34.

The square root of 1438378 is about 1199.3239762466. The cubic root of 1438378 is about 112.8819086355.

The spelling of 1438378 in words is "one million, four hundred thirty-eight thousand, three hundred seventy-eight".