1206389856 has 48 divisors (see below), whose sum is σ = 3619171584. Its totient is φ = 344682624.

The previous prime is 1206389851. The next prime is 1206389861. The reversal of 1206389856 is 6589836021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1206389851) and next prime (1206389861).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206389851) 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, 896940 + ... + 898283.

It is an arithmetic number, because the mean of its divisors is an integer number (75399408).

Almost surely, 2^1206389856 is an apocalyptic number.

1206389856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1206389856 is an abundant number, since it is smaller than the sum of its proper divisors (2412781728).

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

1206389856 is a wasteful number, since it uses less digits than its factorization.

1206389856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795243 (or 1795235 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 1206389856 is about 34733.1233263005. The cubic root of 1206389856 is about 1064.5414076177.

The spelling of 1206389856 in words is "one billion, two hundred six million, three hundred eighty-nine thousand, eight hundred fifty-six".