39393939 has 32 divisors (see below), whose sum is σ = 58330944. Its totient is φ = 23500800.

The previous prime is 39393899. The next prime is 39393971. The reversal of 39393939 is 93939393.

It is not a de Polignac number, because 39393939 - 2¹² = 39389843 is a prime.

39393939 is an undulating number in base 10.

39393939 is a modest number, since divided by 393939 gives 39 as remainder.

It is not an unprimeable number, because it can be changed into a prime (39393139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287479 + ... + 287615.

It is an arithmetic number, because the mean of its divisors is an integer number (1822842).

Almost surely, 2^39393939 is an apocalyptic number.

39393939 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

39393939 is a deficient number, since it is larger than the sum of its proper divisors (18937005).

39393939 is a wasteful number, since it uses less digits than its factorization.

39393939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327.

The product of its digits is 531441, while the sum is 48.

The square root of 39393939 is about 6276.4591132262. The cubic root of 39393939 is about 340.2591421132.

The spelling of 39393939 in words is "thirty-nine million, three hundred ninety-three thousand, nine hundred thirty-nine".