1990761 has 4 divisors (see below), whose sum is σ = 2654352. Its totient is φ = 1327172.

The previous prime is 1990759. The next prime is 1990787. The reversal of 1990761 is 1670991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1990761 - 2¹ = 1990759 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1990361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331791 + ... + 331796.

It is an arithmetic number, because the mean of its divisors is an integer number (663588).

2^1990761 is an apocalyptic number.

It is an amenable number.

1990761 is a deficient number, since it is larger than the sum of its proper divisors (663591).

1990761 is an equidigital number, since it uses as much as digits as its factorization.

1990761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663590.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 1990761 is about 1410.9433014831. The cubic root of 1990761 is about 125.7977986392.

The spelling of 1990761 in words is "one million, nine hundred ninety thousand, seven hundred sixty-one".