1206863440 has 20 divisors (see below), whose sum is σ = 2805957684. Its totient is φ = 482745344.

The previous prime is 1206863431. The next prime is 1206863461. The reversal of 1206863440 is 443686021.

It can be written as a sum of positive squares in 2 ways, for example, as 621804096 + 585059344 = 24936^2 + 24188^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1206863396 and 1206863405.

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, 7542817 + ... + 7542976.

Almost surely, 2^1206863440 is an apocalyptic number.

1206863440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206863440 is an abundant number, since it is smaller than the sum of its proper divisors (1599094244).

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

1206863440 is a wasteful number, since it uses less digits than its factorization.

1206863440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15085806 (or 15085800 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 1206863440 is about 34739.9401266036. The cubic root of 1206863440 is about 1064.6806892437.

The spelling of 1206863440 in words is "one billion, two hundred six million, eight hundred sixty-three thousand, four hundred forty".