3923991007 has 4 divisors (see below), whose sum is σ = 4030044856. Its totient is φ = 3817937160.

The previous prime is 3923990999. The next prime is 3923991041. The reversal of 3923991007 is 7001993293.

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 3923991007 - 2³ = 3923990999 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 (3923991307) 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, 53026869 + ... + 53026942.

It is an arithmetic number, because the mean of its divisors is an integer number (1007511214).

Almost surely, 2^3923991007 is an apocalyptic number.

3923991007 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

3923991007 is a deficient number, since it is larger than the sum of its proper divisors (106053849).

3923991007 is a wasteful number, since it uses less digits than its factorization.

3923991007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106053848.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 3923991007 is about 62641.7672723240. The cubic root of 3923991007 is about 1577.2819538840.

The spelling of 3923991007 in words is "three billion, nine hundred twenty-three million, nine hundred ninety-one thousand, seven".