34399921 has 2 divisors, whose sum is σ = 34399922. Its totient is φ = 34399920.

The previous prime is 34399919. The next prime is 34399991. The reversal of 34399921 is 12999343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23902321 + 10497600 = 4889^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 34399921 - 2¹ = 34399919 is a prime.

Together with 34399919, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (34399901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17199960 + 17199961.

It is an arithmetic number, because the mean of its divisors is an integer number (17199961).

Almost surely, 2^34399921 is an apocalyptic number.

It is an amenable number.

34399921 is a deficient number, since it is larger than the sum of its proper divisors (1).

34399921 is an equidigital number, since it uses as much as digits as its factorization.

34399921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 34399921 is about 5865.1445847481. The cubic root of 34399921 is about 325.2264173734.

The spelling of 34399921 in words is "thirty-four million, three hundred ninety-nine thousand, nine hundred twenty-one".