90219405 has 8 divisors (see below), whose sum is σ = 144351072. Its totient is φ = 48117008.

The previous prime is 90219397. The next prime is 90219407. The reversal of 90219405 is 50491209.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90219405 - 2³ = 90219397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90219407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3007299 + ... + 3007328.

It is an arithmetic number, because the mean of its divisors is an integer number (18043884).

Almost surely, 2^90219405 is an apocalyptic number.

It is an amenable number.

90219405 is a deficient number, since it is larger than the sum of its proper divisors (54131667).

90219405 is a wasteful number, since it uses less digits than its factorization.

90219405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014635.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 90219405 is about 9498.3896003481. The cubic root of 90219405 is about 448.5043430612.

The spelling of 90219405 in words is "ninety million, two hundred nineteen thousand, four hundred five".