1945640 has 32 divisors (see below), whose sum is σ = 4423680. Its totient is φ = 770112.

The previous prime is 1945637. The next prime is 1945649. The reversal of 1945640 is 465491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4889 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (138240).

2^1945640 is an apocalyptic number.

1945640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1945640 is an abundant number, since it is smaller than the sum of its proper divisors (2478040).

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

1945640 is a wasteful number, since it uses less digits than its factorization.

1945640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1945640 is about 1394.8620003427. The cubic root of 1945640 is about 124.8401155830.

The spelling of 1945640 in words is "one million, nine hundred forty-five thousand, six hundred forty".