90840473 has 2 divisors, whose sum is σ = 90840474. Its totient is φ = 90840472.

The previous prime is 90840437. The next prime is 90840479. The reversal of 90840473 is 37404809.

Together with previous prime (90840437) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54213769 + 36626704 = 7363^2 + 6052^2 .

It is a cyclic number.

It is not a de Polignac number, because 90840473 - 2¹² = 90836377 is a prime.

It is not a weakly prime, because it can be changed into another prime (90840479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420236 + 45420237.

It is an arithmetic number, because the mean of its divisors is an integer number (45420237).

Almost surely, 2^90840473 is an apocalyptic number.

It is an amenable number.

90840473 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840473 is an equidigital number, since it uses as much as digits as its factorization.

90840473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 90840473 is about 9531.0268596831. The cubic root of 90840473 is about 449.5311544877.

The spelling of 90840473 in words is "ninety million, eight hundred forty thousand, four hundred seventy-three".