90440047 has 2 divisors, whose sum is σ = 90440048. Its totient is φ = 90440046.

The previous prime is 90440041. The next prime is 90440081. The reversal of 90440047 is 74004409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90440047 - 2³ = 90440039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90439997 and 90440024.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90440041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45220023 + 45220024.

It is an arithmetic number, because the mean of its divisors is an integer number (45220024).

Almost surely, 2^90440047 is an apocalyptic number.

90440047 is a deficient number, since it is larger than the sum of its proper divisors (1).

90440047 is an equidigital number, since it uses as much as digits as its factorization.

90440047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 90440047 is about 9509.9972134591. The cubic root of 90440047 is about 448.8696685064.

The spelling of 90440047 in words is "ninety million, four hundred forty thousand, forty-seven".