1947640 has 64 divisors (see below), whose sum is σ = 4795200. Its totient is φ = 709632.

The previous prime is 1947629. The next prime is 1947641. The reversal of 1947640 is 467491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26644 + ... + 26716.

It is an arithmetic number, because the mean of its divisors is an integer number (74925).

2^1947640 is an apocalyptic number.

1947640 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 1947640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2397600).

1947640 is an abundant number, since it is smaller than the sum of its proper divisors (2847560).

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

1947640 is a wasteful number, since it uses less digits than its factorization.

1947640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1947640 is about 1395.5787329993. The cubic root of 1947640 is about 124.8828769585.

The spelling of 1947640 in words is "one million, nine hundred forty-seven thousand, six hundred forty".