1990056974 has 4 divisors (see below), whose sum is σ = 2985085464. Its totient is φ = 995028486.

The previous prime is 1990056973. The next prime is 1990056977. The reversal of 1990056974 is 4796500991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4796500991 = 43067 ⋅111373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990056973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497514242 + ... + 497514245.

It is an arithmetic number, because the mean of its divisors is an integer number (746271366).

Almost surely, 2^1990056974 is an apocalyptic number.

1990056974 is a deficient number, since it is larger than the sum of its proper divisors (995028490).

1990056974 is an equidigital number, since it uses as much as digits as its factorization.

1990056974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995028489.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 1990056974 is about 44610.0546289735. The cubic root of 1990056974 is about 1257.8296756655.

The spelling of 1990056974 in words is "one billion, nine hundred ninety million, fifty-six thousand, nine hundred seventy-four".