1989970 has 8 divisors (see below), whose sum is σ = 3581964. Its totient is φ = 795984.

The previous prime is 1989961. The next prime is 1989973. The reversal of 1989970 is 799891.

It can be written as a sum of positive squares in 2 ways, for example, as 1814409 + 175561 = 1347^2 + 419^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1989973) 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, 99489 + ... + 99508.

2^1989970 is an apocalyptic number.

1989970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989970 is a deficient number, since it is larger than the sum of its proper divisors (1591994).

1989970 is a wasteful number, since it uses less digits than its factorization.

1989970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199004.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1989970 is about 1410.6629647084. The cubic root of 1989970 is about 125.7811351220.

The spelling of 1989970 in words is "one million, nine hundred eighty-nine thousand, nine hundred seventy".