39421399 has 2 divisors, whose sum is σ = 39421400. Its totient is φ = 39421398.

The previous prime is 39421397. The next prime is 39421439. The reversal of 39421399 is 99312493.

It is an a-pointer prime, because the next prime (39421439) can be obtained adding 39421399 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39421399 - 2¹ = 39421397 is a prime.

Together with 39421397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39421397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19710699 + 19710700.

It is an arithmetic number, because the mean of its divisors is an integer number (19710700).

Almost surely, 2^39421399 is an apocalyptic number.

39421399 is a deficient number, since it is larger than the sum of its proper divisors (1).

39421399 is an equidigital number, since it uses as much as digits as its factorization.

39421399 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 39421399 is about 6278.6462712913. The cubic root of 39421399 is about 340.3381842715.

The spelling of 39421399 in words is "thirty-nine million, four hundred twenty-one thousand, three hundred ninety-nine".