1990472746 has 4 divisors (see below), whose sum is σ = 2985709122. Its totient is φ = 995236372.

The previous prime is 1990472719. The next prime is 1990472767. The reversal of 1990472746 is 6472740991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6472740991 = 11549 ⋅560459.

It can be written as a sum of positive squares in only one way, i.e., 1483097121 + 507375625 = 38511^2 + 22525^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990472746.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497618185 + ... + 497618188.

Almost surely, 2^1990472746 is an apocalyptic number.

1990472746 is a deficient number, since it is larger than the sum of its proper divisors (995236376).

1990472746 is an equidigital number, since it uses as much as digits as its factorization.

1990472746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995236375.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 1990472746 is about 44614.7144561074. The cubic root of 1990472746 is about 1257.9172667832.

The spelling of 1990472746 in words is "one billion, nine hundred ninety million, four hundred seventy-two thousand, seven hundred forty-six".