90004421 has 4 divisors (see below), whose sum is σ = 96927852. Its totient is φ = 83080992.

The previous prime is 90004417. The next prime is 90004459. The reversal of 90004421 is 12440009.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21031396 + 68973025 = 4586^2 + 8305^2 .

It is a cyclic number.

It is not a de Polignac number, because 90004421 - 2² = 90004417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90004393 and 90004402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90004021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461696 + ... + 3461721.

It is an arithmetic number, because the mean of its divisors is an integer number (24231963).

Almost surely, 2^90004421 is an apocalyptic number.

It is an amenable number.

90004421 is a deficient number, since it is larger than the sum of its proper divisors (6923431).

90004421 is a wasteful number, since it uses less digits than its factorization.

90004421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923430.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 90004421 is about 9487.0659848027. The cubic root of 90004421 is about 448.1478124209.

The spelling of 90004421 in words is "ninety million, four thousand, four hundred twenty-one".