42123243440 has 40 divisors (see below), whose sum is σ = 97951886928. Its totient is φ = 16846657280.

The previous prime is 42123243401. The next prime is 42123243469. The reversal of 42123243440 is 4434232124.

It is a tau number, because it is divible by the number of its divisors (40).

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, 519914 + ... + 595446.

Almost surely, 2^42123243440 is an apocalyptic number.

42123243440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42123243440 is an abundant number, since it is smaller than the sum of its proper divisors (55828643488).

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

42123243440 is a wasteful number, since it uses less digits than its factorization.

42123243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82517 (or 82511 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 42123243440 its reverse (4434232124), we get a palindrome (46557475564).

The spelling of 42123243440 in words is "forty-two billion, one hundred twenty-three million, two hundred forty-three thousand, four hundred forty".