240821740 has 12 divisors (see below), whose sum is σ = 505725696. Its totient is φ = 96328688.

The previous prime is 240821729. The next prime is 240821743. The reversal of 240821740 is 47128042.

It is a super-2 number, since 2×240821740² = 115990220913255200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 240821699 and 240821708.

It is not an unprimeable number, because it can be changed into a prime (240821743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6020524 + ... + 6020563.

It is an arithmetic number, because the mean of its divisors is an integer number (42143808).

Almost surely, 2^240821740 is an apocalyptic number.

240821740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

240821740 is an abundant number, since it is smaller than the sum of its proper divisors (264903956).

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

240821740 is a wasteful number, since it uses less digits than its factorization.

240821740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12041096 (or 12041094 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 240821740 is about 15518.4322661795. The cubic root of 240821740 is about 622.1549535886.

Adding to 240821740 its reverse (47128042), we get a palindrome (287949782).

The spelling of 240821740 in words is "two hundred forty million, eight hundred twenty-one thousand, seven hundred forty".