1398040 has 32 divisors (see below), whose sum is σ = 3595680. Its totient is φ = 479232.

The previous prime is 1398037. The next prime is 1398043. The reversal of 1398040 is 408931.

It is an interprime number because it is at equal distance from previous prime (1398037) and next prime (1398043).

It is a junction number, because it is equal to n+sod(n) for n = 1397996 and 1398014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398043) 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, 2217 + ... + 2776.

It is an arithmetic number, because the mean of its divisors is an integer number (112365).

2^1398040 is an apocalyptic number.

1398040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398040 is an abundant number, since it is smaller than the sum of its proper divisors (2197640).

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

1398040 is a wasteful number, since it uses less digits than its factorization.

1398040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 5007 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1398040 is about 1182.3874153593. The cubic root of 1398040 is about 111.8166643427.

The spelling of 1398040 in words is "one million, three hundred ninety-eight thousand, forty".