1398090 has 32 divisors (see below), whose sum is σ = 3473280. Its totient is φ = 359744.

The previous prime is 1398083. The next prime is 1398091. The reversal of 1398090 is 908931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1398091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (108540).

2^1398090 is an apocalyptic number.

1398090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1736640).

1398090 is an abundant number, since it is smaller than the sum of its proper divisors (2075190).

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

1398090 is a wasteful number, since it uses less digits than its factorization.

1398090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1398090 is about 1182.4085588324. The cubic root of 1398090 is about 111.8179973437.

The spelling of 1398090 in words is "one million, three hundred ninety-eight thousand, ninety".