90902239 has 4 divisors (see below), whose sum is σ = 90991440. Its totient is φ = 90813040.

The previous prime is 90902221. The next prime is 90902243. The reversal of 90902239 is 93220909.

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

It is a cyclic number.

It is not a de Polignac number, because 90902239 - 2¹⁹ = 90377951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90902209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43054 + ... + 45115.

It is an arithmetic number, because the mean of its divisors is an integer number (22747860).

Almost surely, 2^90902239 is an apocalyptic number.

90902239 is a deficient number, since it is larger than the sum of its proper divisors (89201).

90902239 is a wasteful number, since it uses less digits than its factorization.

90902239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89200.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 90902239 is about 9534.2665685411. The cubic root of 90902239 is about 449.6330160249.

The spelling of 90902239 in words is "ninety million, nine hundred two thousand, two hundred thirty-nine".