39385421 has 2 divisors, whose sum is σ = 39385422. Its totient is φ = 39385420.

The previous prime is 39385417. The next prime is 39385433. The reversal of 39385421 is 12458393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 3553225 = 5986^2 + 1885^2 .

It is an emirp because it is prime and its reverse (12458393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39385421 - 2² = 39385417 is a prime.

It is a super-2 number, since 2×39385421² = 3102422774694482, which contains 22 as substring.

It is equal to p_2398526 and since 39385421 and 2398526 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39385441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19692710 + 19692711.

It is an arithmetic number, because the mean of its divisors is an integer number (19692711).

Almost surely, 2^39385421 is an apocalyptic number.

It is an amenable number.

39385421 is a deficient number, since it is larger than the sum of its proper divisors (1).

39385421 is an equidigital number, since it uses as much as digits as its factorization.

39385421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 39385421 is about 6275.7805092275. The cubic root of 39385421 is about 340.2346160366.

The spelling of 39385421 in words is "thirty-nine million, three hundred eighty-five thousand, four hundred twenty-one".