39423421 has 2 divisors, whose sum is σ = 39423422. Its totient is φ = 39423420.

The previous prime is 39423359. The next prime is 39423469. The reversal of 39423421 is 12432493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 19263321 = 4490^2 + 4389^2 .

It is an emirp because it is prime and its reverse (12432493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39423421 - 2⁹ = 39422909 is a prime.

It is a super-2 number, since 2×39423421² = 3108412246686482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39423421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39423121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19711710 + 19711711.

It is an arithmetic number, because the mean of its divisors is an integer number (19711711).

Almost surely, 2^39423421 is an apocalyptic number.

It is an amenable number.

39423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

39423421 is an equidigital number, since it uses as much as digits as its factorization.

39423421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 39423421 is about 6278.8072911979. The cubic root of 39423421 is about 340.3440030405.

The spelling of 39423421 in words is "thirty-nine million, four hundred twenty-three thousand, four hundred twenty-one".