1990659 has 16 divisors (see below), whose sum is σ = 2920320. Its totient is φ = 1196160.

The previous prime is 1990657. The next prime is 1990661. The reversal of 1990659 is 9560991.

1990659 = 23⁴ + 24⁴ + ... + 27⁴.

It is an interprime number because it is at equal distance from previous prime (1990657) and next prime (1990661).

It is not a de Polignac number, because 1990659 - 2¹ = 1990657 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1990657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5739 + ... + 6075.

It is an arithmetic number, because the mean of its divisors is an integer number (182520).

2^1990659 is an apocalyptic number.

1990659 is a deficient number, since it is larger than the sum of its proper divisors (929661).

1990659 is a wasteful number, since it uses less digits than its factorization.

1990659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 1990659 is about 1410.9071549893. The cubic root of 1990659 is about 125.7956501150.

The spelling of 1990659 in words is "one million, nine hundred ninety thousand, six hundred fifty-nine".