1398857 has 4 divisors (see below), whose sum is σ = 1401540. Its totient is φ = 1396176.

The previous prime is 1398847. The next prime is 1398863. The reversal of 1398857 is 7588931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7588931 = 7 ⋅1084133.

It can be written as a sum of positive squares in 2 ways, for example, as 241081 + 1157776 = 491^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398857 - 2⁴ = 1398841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398847) 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, 278 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (350385).

2^1398857 is an apocalyptic number.

It is an amenable number.

1398857 is a deficient number, since it is larger than the sum of its proper divisors (2683).

1398857 is an equidigital number, since it uses as much as digits as its factorization.

1398857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682.

The product of its digits is 60480, while the sum is 41.

The square root of 1398857 is about 1182.7328523382. The cubic root of 1398857 is about 111.8384415987.

The spelling of 1398857 in words is "one million, three hundred ninety-eight thousand, eight hundred fifty-seven".