39145399 has 2 divisors, whose sum is σ = 39145400. Its totient is φ = 39145398.

The previous prime is 39145397. The next prime is 39145423. The reversal of 39145399 is 99354193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39145399 - 2¹ = 39145397 is a prime.

Together with 39145397, 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 (39145397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19572699 + 19572700.

It is an arithmetic number, because the mean of its divisors is an integer number (19572700).

Almost surely, 2^39145399 is an apocalyptic number.

39145399 is a deficient number, since it is larger than the sum of its proper divisors (1).

39145399 is an equidigital number, since it uses as much as digits as its factorization.

39145399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 39145399 is about 6256.6284051396. The cubic root of 39145399 is about 339.5420564865.

The spelling of 39145399 in words is "thirty-nine million, one hundred forty-five thousand, three hundred ninety-nine".