90397819 has 2 divisors, whose sum is σ = 90397820. Its totient is φ = 90397818.

The previous prime is 90397793. The next prime is 90397837. The reversal of 90397819 is 91879309.

It is a strong prime.

It is an emirp because it is prime and its reverse (91879309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90397819 - 2⁵ = 90397787 is a prime.

It is a super-4 number, since 4×90397819⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90397849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45198909 + 45198910.

It is an arithmetic number, because the mean of its divisors is an integer number (45198910).

Almost surely, 2^90397819 is an apocalyptic number.

90397819 is a deficient number, since it is larger than the sum of its proper divisors (1).

90397819 is an equidigital number, since it uses as much as digits as its factorization.

90397819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 90397819 is about 9507.7767643125. The cubic root of 90397819 is about 448.7997959965.

The spelling of 90397819 in words is "ninety million, three hundred ninety-seven thousand, eight hundred nineteen".