1378457 has 4 divisors (see below), whose sum is σ = 1426020. Its totient is φ = 1330896.

The previous prime is 1378441. The next prime is 1378499. The reversal of 1378457 is 7548731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7548731 = 17 ⋅444043.

It can be written as a sum of positive squares in 2 ways, for example, as 1175056 + 203401 = 1084^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378457 - 2⁴ = 1378441 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378427) 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, 23738 + ... + 23795.

It is an arithmetic number, because the mean of its divisors is an integer number (356505).

2^1378457 is an apocalyptic number.

It is an amenable number.

1378457 is a deficient number, since it is larger than the sum of its proper divisors (47563).

1378457 is an equidigital number, since it uses as much as digits as its factorization.

1378457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47562.

The product of its digits is 23520, while the sum is 35.

The square root of 1378457 is about 1174.0770843518. The cubic root of 1378457 is about 111.2921180424.

The spelling of 1378457 in words is "one million, three hundred seventy-eight thousand, four hundred fifty-seven".