1378381 has 4 divisors (see below), whose sum is σ = 1395072. Its totient is φ = 1361692.

The previous prime is 1378373. The next prime is 1378387. The reversal of 1378381 is 1838731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1838731 = 1201 ⋅1531.

It is a cyclic number.

It is not a de Polignac number, because 1378381 - 2³ = 1378373 is a prime.

It is a super-2 number, since 2×1378381² = 3799868362322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1378381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378387) 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, 8221 + ... + 8386.

It is an arithmetic number, because the mean of its divisors is an integer number (348768).

2^1378381 is an apocalyptic number.

It is an amenable number.

1378381 is a deficient number, since it is larger than the sum of its proper divisors (16691).

1378381 is an equidigital number, since it uses as much as digits as its factorization.

1378381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16690.

The product of its digits is 4032, while the sum is 31.

The square root of 1378381 is about 1174.0447180580. The cubic root of 1378381 is about 111.2900726742.

The spelling of 1378381 in words is "one million, three hundred seventy-eight thousand, three hundred eighty-one".