1686972990 has 32 divisors (see below), whose sum is σ = 4142894976. Its totient is φ = 439397280.

The previous prime is 1686972961. The next prime is 1686973009. The reversal of 1686972990 is 992796861.

It is a self number, because there is not a number n which added to its sum of digits gives 1686972990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652576 + ... + 655155.

It is an arithmetic number, because the mean of its divisors is an integer number (129465468).

Almost surely, 2^1686972990 is an apocalyptic number.

1686972990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1686972990 is an abundant number, since it is smaller than the sum of its proper divisors (2455921986).

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

1686972990 is a wasteful number, since it uses less digits than its factorization.

1686972990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307784.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The square root of 1686972990 is about 41072.7767505437. The cubic root of 1686972990 is about 1190.4268388529.

The spelling of 1686972990 in words is "one billion, six hundred eighty-six million, nine hundred seventy-two thousand, nine hundred ninety".