1398381 has 8 divisors (see below), whose sum is σ = 1962720. Its totient is φ = 883152.

The previous prime is 1398367. The next prime is 1398401. The reversal of 1398381 is 1838931.

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

It is not a de Polignac number, because 1398381 - 2⁵ = 1398349 is a prime.

It is a super-2 number, since 2×1398381² = 3910938842322, which contains 22 as substring.

It is an Ulam number.

1398381 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398281) 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, 12210 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (245340).

2^1398381 is an apocalyptic number.

It is an amenable number.

1398381 is a deficient number, since it is larger than the sum of its proper divisors (564339).

1398381 is a wasteful number, since it uses less digits than its factorization.

1398381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24555.

The product of its digits is 5184, while the sum is 33.

The square root of 1398381 is about 1182.5316063429. The cubic root of 1398381 is about 111.8257547795.

The spelling of 1398381 in words is "one million, three hundred ninety-eight thousand, three hundred eighty-one".