3967493945 has 16 divisors (see below), whose sum is σ = 4882202640. Its totient is φ = 3093350400.

The previous prime is 3967493939. The next prime is 3967493947. The reversal of 3967493945 is 5493947693.

It can be written as a sum of positive squares in 8 ways, for example, as 380562064 + 3586931881 = 19508^2 + 59891^2 .

It is not a de Polignac number, because 3967493945 - 2⁸ = 3967493689 is a prime.

It is a super-2 number, since 2×3967493945² = 31482016407223326050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3967493947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197255 + ... + 216435.

It is an arithmetic number, because the mean of its divisors is an integer number (305137665).

Almost surely, 2^3967493945 is an apocalyptic number.

It is an amenable number.

3967493945 is a deficient number, since it is larger than the sum of its proper divisors (914708695).

3967493945 is a wasteful number, since it uses less digits than its factorization.

3967493945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20236.

The product of its digits is 22044960, while the sum is 59.

The square root of 3967493945 is about 62988.0460484368. The cubic root of 3967493945 is about 1583.0893388993.

The spelling of 3967493945 in words is "three billion, nine hundred sixty-seven million, four hundred ninety-three thousand, nine hundred forty-five".