3942665945 has 4 divisors (see below), whose sum is σ = 4731199140. Its totient is φ = 3154132752.

The previous prime is 3942665941. The next prime is 3942665983. The reversal of 3942665945 is 5495662493.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2534014921 + 1408651024 = 50339^2 + 37532^2 .

It is a cyclic number.

It is not a de Polignac number, because 3942665945 - 2² = 3942665941 is a prime.

It is a super-2 number, since 2×3942665945² = 31089229507725486050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3942665941) 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, 394266590 + ... + 394266599.

It is an arithmetic number, because the mean of its divisors is an integer number (1182799785).

Almost surely, 2^3942665945 is an apocalyptic number.

It is an amenable number.

3942665945 is a deficient number, since it is larger than the sum of its proper divisors (788533195).

3942665945 is an equidigital number, since it uses as much as digits as its factorization.

3942665945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788533194.

The product of its digits is 6998400, while the sum is 53.

The square root of 3942665945 is about 62790.6517325629. The cubic root of 3942665945 is about 1579.7801789200.

The spelling of 3942665945 in words is "three billion, nine hundred forty-two million, six hundred sixty-five thousand, nine hundred forty-five".