1206640 has 20 divisors (see below), whose sum is σ = 2805624. Its totient is φ = 482624.

The previous prime is 1206637. The next prime is 1206679. The reversal of 1206640 is 466021.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7462 + ... + 7621.

2^1206640 is an apocalyptic number.

1206640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206640 is an abundant number, since it is smaller than the sum of its proper divisors (1598984).

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

1206640 is a wasteful number, since it uses less digits than its factorization.

1206640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15096 (or 15090 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1206640 is about 1098.4716655426. The cubic root of 1206640 is about 106.4614979811.

The spelling of 1206640 in words is "one million, two hundred six thousand, six hundred forty".