1990471974 has 16 divisors (see below), whose sum is σ = 3981755712. Its totient is φ = 663355368.

The previous prime is 1990471969. The next prime is 1990471993. The reversal of 1990471974 is 4791740991.

It is a Curzon number.

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, 777 + ... + 63099.

It is an arithmetic number, because the mean of its divisors is an integer number (248859732).

Almost surely, 2^1990471974 is an apocalyptic number.

1990471974 is an abundant number, since it is smaller than the sum of its proper divisors (1991283738).

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

1990471974 is a wasteful number, since it uses less digits than its factorization.

1990471974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67651.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 1990471974 is about 44614.7058042525. The cubic root of 1990471974 is about 1257.9171041564.

The spelling of 1990471974 in words is "one billion, nine hundred ninety million, four hundred seventy-one thousand, nine hundred seventy-four".