90019397242 has 8 divisors (see below), whose sum is σ = 136224043956. Its totient is φ = 44611382592.

The previous prime is 90019397219. The next prime is 90019397243. The reversal of 90019397242 is 24279391009.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71113422241 + 18905975001 = 266671^2 + 137499^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 90019397192 and 90019397201.

It is not an unprimeable number, because it can be changed into a prime (90019397243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199157733 + ... + 199158184.

Almost surely, 2^90019397242 is an apocalyptic number.

90019397242 is a deficient number, since it is larger than the sum of its proper divisors (46204646714).

90019397242 is a wasteful number, since it uses less digits than its factorization.

90019397242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398316032.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 90019397242 in words is "ninety billion, nineteen million, three hundred ninety-seven thousand, two hundred forty-two".