90493042 has 4 divisors (see below), whose sum is σ = 135739566. Its totient is φ = 45246520.

The previous prime is 90493037. The next prime is 90493049. The reversal of 90493042 is 24039409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24039409 = 4903².

It can be written as a sum of positive squares in only one way, i.e., 89851441 + 641601 = 9479^2 + 801^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 90492995 and 90493013.

It is not an unprimeable number, because it can be changed into a prime (90493049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22623259 + ... + 22623262.

Almost surely, 2^90493042 is an apocalyptic number.

90493042 is a deficient number, since it is larger than the sum of its proper divisors (45246524).

90493042 is a wasteful number, since it uses less digits than its factorization.

90493042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45246523.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 90493042 is about 9512.7830838299. The cubic root of 90493042 is about 448.9573258517.

The spelling of 90493042 in words is "ninety million, four hundred ninety-three thousand, forty-two".