1398660 has 24 divisors (see below), whose sum is σ = 3916416. Its totient is φ = 372960.

The previous prime is 1398659. The next prime is 1398667. The reversal of 1398660 is 668931.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398667) 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, 11596 + ... + 11715.

It is an arithmetic number, because the mean of its divisors is an integer number (163184).

2^1398660 is an apocalyptic number.

1398660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398660 is an abundant number, since it is smaller than the sum of its proper divisors (2517756).

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

1398660 is a wasteful number, since it uses less digits than its factorization.

1398660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23323 (or 23321 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1398660 is about 1182.6495677080. The cubic root of 1398660 is about 111.8331913104.

It can be divided in two parts, 13986 and 60, that multiplied together give a triangular number (839160 = T₁₂₉₅).

The spelling of 1398660 in words is "one million, three hundred ninety-eight thousand, six hundred sixty".