1945880 has 16 divisors (see below), whose sum is σ = 4378320. Its totient is φ = 778336.

The previous prime is 1945873. The next prime is 1945883. The reversal of 1945880 is 885491.

It is a self number, because there is not a number n which added to its sum of digits gives 1945880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945883) 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, 24284 + ... + 24363.

It is an arithmetic number, because the mean of its divisors is an integer number (273645).

2^1945880 is an apocalyptic number.

1945880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1945880 is an abundant number, since it is smaller than the sum of its proper divisors (2432440).

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

1945880 is a wasteful number, since it uses less digits than its factorization.

1945880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48658 (or 48654 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1945880 is about 1394.9480277057. The cubic root of 1945880 is about 124.8452484948.

The spelling of 1945880 in words is "one million, nine hundred forty-five thousand, eight hundred eighty".