1398457 has 8 divisors (see below), whose sum is σ = 1490400. Its totient is φ = 1308384.

The previous prime is 1398451. The next prime is 1398473. The reversal of 1398457 is 7548931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1398457 - 2⁷ = 1398329 is a prime.

It is a Duffinian number.

1398457 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1398451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1278 + ... + 2104.

It is an arithmetic number, because the mean of its divisors is an integer number (186300).

2^1398457 is an apocalyptic number.

It is an amenable number.

1398457 is a deficient number, since it is larger than the sum of its proper divisors (91943).

1398457 is an equidigital number, since it uses as much as digits as its factorization.

1398457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935.

The product of its digits is 30240, while the sum is 37.

The square root of 1398457 is about 1182.5637403540. The cubic root of 1398457 is about 111.8277805992.

It can be divided in two parts, 13984 and 57, that added together give a palindrome (14041).

The spelling of 1398457 in words is "one million, three hundred ninety-eight thousand, four hundred fifty-seven".