1387457 has 4 divisors (see below), whose sum is σ = 1390896. Its totient is φ = 1384020.

The previous prime is 1387433. The next prime is 1387499. The reversal of 1387457 is 7547831.

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: 7547831 = 101 ⋅74731.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387417) 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, 1019 + ... + 1952.

It is an arithmetic number, because the mean of its divisors is an integer number (347724).

2^1387457 is an apocalyptic number.

It is an amenable number.

1387457 is a deficient number, since it is larger than the sum of its proper divisors (3439).

1387457 is an equidigital number, since it uses as much as digits as its factorization.

1387457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438.

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

The square root of 1387457 is about 1177.9036463141. The cubic root of 1387457 is about 111.5338030189.

It can be divided in two parts, 13874 and 57, that added together give a palindrome (13931).

The spelling of 1387457 in words is "one million, three hundred eighty-seven thousand, four hundred fifty-seven".