242921823 has 16 divisors (see below), whose sum is σ = 344180736. Its totient is φ = 151873920.

The previous prime is 242921807. The next prime is 242921831. The reversal of 242921823 is 328129242.

It is not a de Polignac number, because 242921823 - 2⁴ = 242921807 is a prime.

It is a super-2 number, since 2×242921823² = 118022024179286658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242921873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6018 + ... + 22848.

It is an arithmetic number, because the mean of its divisors is an integer number (21511296).

Almost surely, 2^242921823 is an apocalyptic number.

242921823 is a deficient number, since it is larger than the sum of its proper divisors (101258913).

242921823 is a wasteful number, since it uses less digits than its factorization.

242921823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17134.

The product of its digits is 13824, while the sum is 33.

The square root of 242921823 is about 15585.9495379653. The cubic root of 242921823 is about 623.9582201029.

The spelling of 242921823 in words is "two hundred forty-two million, nine hundred twenty-one thousand, eight hundred twenty-three".