240421393 has 4 divisors (see below), whose sum is σ = 244009840. Its totient is φ = 236832948.

The previous prime is 240421381. The next prime is 240421427. The reversal of 240421393 is 393124042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 393124042 = 2 ⋅196562021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240421393 is a prime.

It is a super-3 number, since 3×240421393³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240421373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794123 + ... + 1794256.

It is an arithmetic number, because the mean of its divisors is an integer number (61002460).

Almost surely, 2^240421393 is an apocalyptic number.

It is an amenable number.

240421393 is a deficient number, since it is larger than the sum of its proper divisors (3588447).

240421393 is an equidigital number, since it uses as much as digits as its factorization.

240421393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588446.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 240421393 is about 15505.5278207483. The cubic root of 240421393 is about 621.8100013141.

The spelling of 240421393 in words is "two hundred forty million, four hundred twenty-one thousand, three hundred ninety-three".