1990371761 has 8 divisors (see below), whose sum is σ = 2353149120. Its totient is φ = 1647204048.

The previous prime is 1990371743. The next prime is 1990371767. The reversal of 1990371761 is 1671730991.

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

It is not a de Polignac number, because 1990371761 - 2⁶ = 1990371697 is a prime.

It is a super-2 number, since 2×1990371761² = 7923159493972482242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1990371767) 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, 4902191 + ... + 4902596.

It is an arithmetic number, because the mean of its divisors is an integer number (294143640).

Almost surely, 2^1990371761 is an apocalyptic number.

It is an amenable number.

1990371761 is a deficient number, since it is larger than the sum of its proper divisors (362777359).

1990371761 is an equidigital number, since it uses as much as digits as its factorization.

1990371761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9804823.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 1990371761 is about 44613.5826963045. The cubic root of 1990371761 is about 1257.8959932903.

The spelling of 1990371761 in words is "one billion, nine hundred ninety million, three hundred seventy-one thousand, seven hundred sixty-one".