1239680 has 64 divisors (see below), whose sum is σ = 3213000. Its totient is φ = 454656.

The previous prime is 1239671. The next prime is 1239697. The reversal of 1239680 is 869321.

It can be written as a sum of positive squares in 4 ways, for example, as 506944 + 732736 = 712^2 + 856^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8246 + ... + 8394.

2^1239680 is an apocalyptic number.

1239680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1239680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1606500).

1239680 is an abundant number, since it is smaller than the sum of its proper divisors (1973320).

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

1239680 is a wasteful number, since it uses less digits than its factorization.

1239680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1239680 is about 1113.4091790532. The cubic root of 1239680 is about 107.4244646946.

The spelling of 1239680 in words is "one million, two hundred thirty-nine thousand, six hundred eighty".