243420040442 has 16 divisors (see below), whose sum is σ = 377823254760. Its totient is φ = 117481233408.

The previous prime is 243420040433. The next prime is 243420040477. The reversal of 243420040442 is 244040024342.

It can be written as a sum of positive squares in 4 ways, for example, as 196966428481 + 46453611961 = 443809^2 + 215531^2 .

It is a super-3 number, since 3×243420040442³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 353183 + ... + 782034.

Almost surely, 2^243420040442 is an apocalyptic number.

243420040442 is a deficient number, since it is larger than the sum of its proper divisors (134403214318).

243420040442 is a wasteful number, since it uses less digits than its factorization.

243420040442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138945.

The product of its (nonzero) digits is 24576, while the sum is 29.

Adding to 243420040442 its reverse (244040024342), we get a palindrome (487460064784).

The spelling of 243420040442 in words is "two hundred forty-three billion, four hundred twenty million, forty thousand, four hundred forty-two".