1381457 has 18 divisors (see below), whose sum is σ = 1773954. Its totient is φ = 1071840.

The previous prime is 1381451. The next prime is 1381459. The reversal of 1381457 is 7541831.

It can be written as a sum of positive squares in only one way, i.e., 1002001 + 379456 = 1001^2 + 616^2 .

It is not a de Polignac number, because 1381457 - 2⁴ = 1381441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381451) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5813 + ... + 6045.

It is an arithmetic number, because the mean of its divisors is an integer number (98553).

2^1381457 is an apocalyptic number.

It is an amenable number.

1381457 is a deficient number, since it is larger than the sum of its proper divisors (392497).

1381457 is a wasteful number, since it uses less digits than its factorization.

1381457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 251 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 1381457 is about 1175.3539892305. The cubic root of 1381457 is about 111.3727962781.

The spelling of 1381457 in words is "one million, three hundred eighty-one thousand, four hundred fifty-seven".