1989156 has 48 divisors (see below), whose sum is σ = 5136768. Its totient is φ = 595200.

The previous prime is 1989151. The next prime is 1989161. The reversal of 1989156 is 6519891.

It is an interprime number because it is at equal distance from previous prime (1989151) and next prime (1989161).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1989151) 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, 6241 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (107016).

2^1989156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2568384).

1989156 is an abundant number, since it is smaller than the sum of its proper divisors (3147612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989156 is a wasteful number, since it uses less digits than its factorization.

1989156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 370 counting only the distinct ones).

The product of its digits is 19440, while the sum is 39.

The square root of 1989156 is about 1410.3744183727. The cubic root of 1989156 is about 125.7639824668.

It can be divided in two parts, 1989 and 156, that added together give a triangular number (2145 = T₆₅).

The spelling of 1989156 in words is "one million, nine hundred eighty-nine thousand, one hundred fifty-six".