1666939400 has 48 divisors (see below), whose sum is σ = 4429299840. Its totient is φ = 571521600.

The previous prime is 1666939367. The next prime is 1666939423. The reversal of 1666939400 is 49396661.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 593936 + ... + 596735.

It is an arithmetic number, because the mean of its divisors is an integer number (92277080).

Almost surely, 2^1666939400 is an apocalyptic number.

1666939400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666939400 is an abundant number, since it is smaller than the sum of its proper divisors (2762360440).

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

1666939400 is a wasteful number, since it uses less digits than its factorization.

1666939400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190694 (or 1190685 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 1666939400 is about 40828.1691972589. The cubic root of 1666939400 is about 1185.6957701938.

The spelling of 1666939400 in words is "one billion, six hundred sixty-six million, nine hundred thirty-nine thousand, four hundred".