39905493 has 4 divisors (see below), whose sum is σ = 53207328. Its totient is φ = 26603660.

The previous prime is 39905473. The next prime is 39905501. The reversal of 39905493 is 39450993.

It is a happy number.

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 39905493 - 2¹⁶ = 39839957 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39905413) 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, 6650913 + ... + 6650918.

It is an arithmetic number, because the mean of its divisors is an integer number (13301832).

Almost surely, 2^39905493 is an apocalyptic number.

It is an amenable number.

39905493 is a deficient number, since it is larger than the sum of its proper divisors (13301835).

39905493 is a wasteful number, since it uses less digits than its factorization.

39905493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13301834.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 39905493 is about 6317.0794676021. The cubic root of 39905493 is about 341.7256357733.

The spelling of 39905493 in words is "thirty-nine million, nine hundred five thousand, four hundred ninety-three".