39953989 has 4 divisors (see below), whose sum is σ = 39970656. Its totient is φ = 39937324.

The previous prime is 39953987. The next prime is 39953993. The reversal of 39953989 is 98935993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39953989 - 2¹ = 39953987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39953987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3979 + ... + 9784.

It is an arithmetic number, because the mean of its divisors is an integer number (9992664).

Almost surely, 2^39953989 is an apocalyptic number.

It is an amenable number.

39953989 is a deficient number, since it is larger than the sum of its proper divisors (16667).

39953989 is a wasteful number, since it uses less digits than its factorization.

39953989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16666.

The product of its digits is 2361960, while the sum is 55.

The square root of 39953989 is about 6320.9167847710. The cubic root of 39953989 is about 341.8640095194.

The spelling of 39953989 in words is "thirty-nine million, nine hundred fifty-three thousand, nine hundred eighty-nine".