242120405 has 8 divisors (see below), whose sum is σ = 290628000. Its totient is φ = 193640656.

The previous prime is 242120393. The next prime is 242120413. The reversal of 242120405 is 504021242.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 242120405 - 2²⁶ = 175011541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30986 + ... + 38004.

It is an arithmetic number, because the mean of its divisors is an integer number (36328500).

Almost surely, 2^242120405 is an apocalyptic number.

It is an amenable number.

242120405 is a deficient number, since it is larger than the sum of its proper divisors (48507595).

242120405 is an equidigital number, since it uses as much as digits as its factorization.

242120405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13923.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 242120405 is about 15560.2186681293. The cubic root of 242120405 is about 623.2713019063.

Adding to 242120405 its reverse (504021242), we get a palindrome (746141647).

The spelling of 242120405 in words is "two hundred forty-two million, one hundred twenty thousand, four hundred five".