3943494637 has 2 divisors, whose sum is σ = 3943494638. Its totient is φ = 3943494636.

The previous prime is 3943494629. The next prime is 3943494649. The reversal of 3943494637 is 7364943493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3097033801 + 846460836 = 55651^2 + 29094^2 .

It is a cyclic number.

It is not a de Polignac number, because 3943494637 - 2³ = 3943494629 is a prime.

It is a super-2 number, since 2×3943494637² = 31102299904095523538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3943494937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971747318 + 1971747319.

It is an arithmetic number, because the mean of its divisors is an integer number (1971747319).

Almost surely, 2^3943494637 is an apocalyptic number.

It is an amenable number.

3943494637 is a deficient number, since it is larger than the sum of its proper divisors (1).

3943494637 is an equidigital number, since it uses as much as digits as its factorization.

3943494637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 52.

The square root of 3943494637 is about 62797.2502343853. The cubic root of 3943494637 is about 1579.8908535670.

The spelling of 3943494637 in words is "three billion, nine hundred forty-three million, four hundred ninety-four thousand, six hundred thirty-seven".