1398705 has 48 divisors (see below), whose sum is σ = 2856384. Its totient is φ = 577920.

The previous prime is 1398701. The next prime is 1398707. The reversal of 1398705 is 5078931.

It is not a de Polignac number, because 1398705 - 2² = 1398701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

1398705 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398701) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7999 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (59508).

2^1398705 is an apocalyptic number.

1398705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1398705 is an abundant number, since it is smaller than the sum of its proper divisors (1457679).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398705 is a wasteful number, since it uses less digits than its factorization.

1398705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1398705 is about 1182.6685926328. The cubic root of 1398705 is about 111.8343906583.

The spelling of 1398705 in words is "one million, three hundred ninety-eight thousand, seven hundred five".