1989950 has 12 divisors (see below), whose sum is σ = 3701400. Its totient is φ = 795960.

The previous prime is 1989947. The next prime is 1989959. The reversal of 1989950 is 599891.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1989898 and 1989907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19850 + ... + 19949.

It is an arithmetic number, because the mean of its divisors is an integer number (308450).

2^1989950 is an apocalyptic number.

1989950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989950 is a deficient number, since it is larger than the sum of its proper divisors (1711450).

1989950 is a wasteful number, since it uses less digits than its factorization.

1989950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39811 (or 39806 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 1989950 is about 1410.6558758251. The cubic root of 1989950 is about 125.7807137369.

The spelling of 1989950 in words is "one million, nine hundred eighty-nine thousand, nine hundred fifty".