1986931973 has 8 divisors (see below), whose sum is σ = 2252392800. Its totient is φ = 1737559728.

The previous prime is 1986931913. The next prime is 1986931987. The reversal of 1986931973 is 3791396891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1986931973 - 2⁸ = 1986931717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986931913) 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, 4021883 + ... + 4022376.

It is an arithmetic number, because the mean of its divisors is an integer number (281549100).

Almost surely, 2^1986931973 is an apocalyptic number.

1986931973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1986931973 is a deficient number, since it is larger than the sum of its proper divisors (265460827).

1986931973 is a wasteful number, since it uses less digits than its factorization.

1986931973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8044291.

The product of its digits is 2204496, while the sum is 56.

The square root of 1986931973 is about 44575.0151205807. The cubic root of 1986931973 is about 1257.1709376961.

The spelling of 1986931973 in words is "one billion, nine hundred eighty-six million, nine hundred thirty-one thousand, nine hundred seventy-three".