2723240 has 32 divisors (see below), whose sum is σ = 6599880. Its totient is φ = 1005312.

The previous prime is 2723239. The next prime is 2723243. The reversal of 2723240 is 423272.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2184484 + 538756 = 1478^2 + 734^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2723243) 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, 2099 + ... + 3138.

2^2723240 is an apocalyptic number.

2723240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2723240 is an abundant number, since it is smaller than the sum of its proper divisors (3876640).

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

2723240 is a wasteful number, since it uses less digits than its factorization.

2723240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261 (or 5257 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 2723240 is about 1650.2242271885. The cubic root of 2723240 is about 139.6460446411.

Subtracting from 2723240 its reverse (423272), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 27232 and 40, that added together give a palindrome (27272).

The spelling of 2723240 in words is "two million, seven hundred twenty-three thousand, two hundred forty".