34387421 has 2 divisors, whose sum is σ = 34387422. Its totient is φ = 34387420.

The previous prime is 34387391. The next prime is 34387427. The reversal of 34387421 is 12478343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 36100 = 5861^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 34387421 - 2¹⁰ = 34386397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34387427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17193710 + 17193711.

It is an arithmetic number, because the mean of its divisors is an integer number (17193711).

Almost surely, 2^34387421 is an apocalyptic number.

It is an amenable number.

34387421 is a deficient number, since it is larger than the sum of its proper divisors (1).

34387421 is an equidigital number, since it uses as much as digits as its factorization.

34387421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 34387421 is about 5864.0788705474. The cubic root of 34387421 is about 325.1870197758.

The spelling of 34387421 in words is "thirty-four million, three hundred eighty-seven thousand, four hundred twenty-one".