1945940 has 24 divisors (see below), whose sum is σ = 4120200. Its totient is φ = 771968.

The previous prime is 1945919. The next prime is 1945943. The reversal of 1945940 is 495491.

It can be written as a sum of positive squares in 4 ways, for example, as 2704 + 1943236 = 52^2 + 1394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1945897 and 1945906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2654 + ... + 3306.

It is an arithmetic number, because the mean of its divisors is an integer number (171675).

2^1945940 is an apocalyptic number.

1945940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1945940 is an abundant number, since it is smaller than the sum of its proper divisors (2174260).

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

1945940 is a wasteful number, since it uses less digits than its factorization.

1945940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1945940 is about 1394.9695337175. The cubic root of 1945940 is about 124.8465316569.

The spelling of 1945940 in words is "one million, nine hundred forty-five thousand, nine hundred forty".