90420489 has 16 divisors (see below), whose sum is σ = 137578240. Its totient is φ = 58650480.

The previous prime is 90420469. The next prime is 90420497. The reversal of 90420489 is 98402409.

It is a happy number.

It is not a de Polignac number, because 90420489 - 2⁹ = 90419977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90420409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44257 + ... + 46254.

It is an arithmetic number, because the mean of its divisors is an integer number (8598640).

Almost surely, 2^90420489 is an apocalyptic number.

It is an amenable number.

90420489 is a deficient number, since it is larger than the sum of its proper divisors (47157751).

90420489 is a wasteful number, since it uses less digits than its factorization.

90420489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90557 (or 90551 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 90420489 is about 9508.9688715444. The cubic root of 90420489 is about 448.8373095895.

It can be divided in two parts, 90420 and 489, that added together give a palindrome (90909).

The spelling of 90420489 in words is "ninety million, four hundred twenty thousand, four hundred eighty-nine".