240021396 has 18 divisors (see below), whose sum is σ = 606720842. Its totient is φ = 80007120.

The previous prime is 240021391. The next prime is 240021407. The reversal of 240021396 is 693120042.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 110880900 = 11364^2 + 10530^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×240021396² = 115220541075577632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240021391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3333595 + ... + 3333666.

Almost surely, 2^240021396 is an apocalyptic number.

It is an amenable number.

240021396 is an abundant number, since it is smaller than the sum of its proper divisors (366699446).

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

240021396 is a wasteful number, since it uses less digits than its factorization.

240021396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667271 (or 6667266 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 240021396 is about 15492.6239223703. The cubic root of 240021396 is about 621.4649679605.

The spelling of 240021396 in words is "two hundred forty million, twenty-one thousand, three hundred ninety-six".