1971240 has 32 divisors (see below), whose sum is σ = 5914080. Its totient is φ = 525632.

The previous prime is 1971209. The next prime is 1971241. The reversal of 1971240 is 421791.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1971240.

It is not an unprimeable number, because it can be changed into a prime (1971241) 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, 8094 + ... + 8333.

It is an arithmetic number, because the mean of its divisors is an integer number (184815).

2^1971240 is an apocalyptic number.

1971240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1971240 is an abundant number, since it is smaller than the sum of its proper divisors (3942840).

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

1971240 is a wasteful number, since it uses less digits than its factorization.

1971240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16441 (or 16437 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1971240 is about 1404.0085469825. The cubic root of 1971240 is about 125.3852646824.

Subtracting from 1971240 its sum of digits (24), we obtain a square (1971216 = 1404²).

It can be divided in two parts, 1971 and 240, that added together give a triangular number (2211 = T₆₆).

The spelling of 1971240 in words is "one million, nine hundred seventy-one thousand, two hundred forty".