1206156640 has 48 divisors (see below), whose sum is σ = 3068746128. Its totient is φ = 445349376.

The previous prime is 1206156607. The next prime is 1206156659. The reversal of 1206156640 is 466516021.

It is a congruent number.

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, 287862 + ... + 292021.

It is an arithmetic number, because the mean of its divisors is an integer number (63932211).

Almost surely, 2^1206156640 is an apocalyptic number.

1206156640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206156640 is an abundant number, since it is smaller than the sum of its proper divisors (1862589488).

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

1206156640 is a wasteful number, since it uses less digits than its factorization.

1206156640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579911 (or 579903 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1206156640 is about 34729.7659076476. The cubic root of 1206156640 is about 1064.4728051154.

The spelling of 1206156640 in words is "one billion, two hundred six million, one hundred fifty-six thousand, six hundred forty".