1990071 has 12 divisors (see below), whose sum is σ = 3043872. Its totient is φ = 1248576.

The previous prime is 1990069. The next prime is 1990081. The reversal of 1990071 is 1700991.

It is not a de Polignac number, because 1990071 - 2¹ = 1990069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6351 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (253656).

2^1990071 is an apocalyptic number.

1990071 is a deficient number, since it is larger than the sum of its proper divisors (1053801).

1990071 is a wasteful number, since it uses less digits than its factorization.

1990071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13030 (or 13027 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 1990071 is about 1410.6987630249. The cubic root of 1990071 is about 125.7832630736.

The spelling of 1990071 in words is "one million, nine hundred ninety thousand, seventy-one".