39955399 has 4 divisors (see below), whose sum is σ = 43587720. Its totient is φ = 36323080.

The previous prime is 39955381. The next prime is 39955403. The reversal of 39955399 is 99355993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39955399 - 2¹¹ = 39953351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39955319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816144 + ... + 1816165.

It is an arithmetic number, because the mean of its divisors is an integer number (10896930).

Almost surely, 2^39955399 is an apocalyptic number.

39955399 is a deficient number, since it is larger than the sum of its proper divisors (3632321).

39955399 is a wasteful number, since it uses less digits than its factorization.

39955399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632320.

The product of its digits is 1476225, while the sum is 52.

The square root of 39955399 is about 6321.0283182406. The cubic root of 39955399 is about 341.8680310001.

The spelling of 39955399 in words is "thirty-nine million, nine hundred fifty-five thousand, three hundred ninety-nine".