1961780 has 24 divisors (see below), whose sum is σ = 4209408. Its totient is φ = 767648.

The previous prime is 1961767. The next prime is 1961797. The reversal of 1961780 is 871691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (175392).

2^1961780 is an apocalyptic number.

1961780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961780 is an abundant number, since it is smaller than the sum of its proper divisors (2247628).

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

1961780 is a wasteful number, since it uses less digits than its factorization.

1961780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 2141 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1961780 is about 1400.6355700181. The cubic root of 1961780 is about 125.1843679340.

The spelling of 1961780 in words is "one million, nine hundred sixty-one thousand, seven hundred eighty".