1939980 has 96 divisors (see below), whose sum is σ = 6451200. Its totient is φ = 426240.

The previous prime is 1939969. The next prime is 1939999. The reversal of 1939980 is 899391.

1939980 = T₁₆₁ + T₁₆₂ + ... + T₂₅₀.

1939980 = 235² + 236² + ... + 265².

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12946 + ... + 13094.

It is an arithmetic number, because the mean of its divisors is an integer number (67200).

2^1939980 is an apocalyptic number.

1939980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1939980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3225600).

1939980 is an abundant number, since it is smaller than the sum of its proper divisors (4511220).

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

1939980 is a wasteful number, since it uses less digits than its factorization.

1939980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1939980 is about 1392.8316481183. The cubic root of 1939980 is about 124.7189418575.

The spelling of 1939980 in words is "one million, nine hundred thirty-nine thousand, nine hundred eighty".