90921742 has 4 divisors (see below), whose sum is σ = 136382616. Its totient is φ = 45460870.

The previous prime is 90921703. The next prime is 90921749. The reversal of 90921742 is 24712909.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 90921698 and 90921707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90921749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22730434 + ... + 22730437.

It is an arithmetic number, because the mean of its divisors is an integer number (34095654).

Almost surely, 2^90921742 is an apocalyptic number.

90921742 is a deficient number, since it is larger than the sum of its proper divisors (45460874).

90921742 is a wasteful number, since it uses less digits than its factorization.

90921742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45460873.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 90921742 is about 9535.2892981807. The cubic root of 90921742 is about 449.6651698558.

The spelling of 90921742 in words is "ninety million, nine hundred twenty-one thousand, seven hundred forty-two".