3937247947 has 4 divisors (see below), whose sum is σ = 3938214456. Its totient is φ = 3936281440.

The previous prime is 3937247929. The next prime is 3937247983. The reversal of 3937247947 is 7497427393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7497427393 = 347 ⋅21606419.

It is a cyclic number.

It is not a de Polignac number, because 3937247947 - 2¹¹ = 3937245899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3937247927) 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, 477118 + ... + 485299.

It is an arithmetic number, because the mean of its divisors is an integer number (984553614).

Almost surely, 2^3937247947 is an apocalyptic number.

3937247947 is a deficient number, since it is larger than the sum of its proper divisors (966509).

3937247947 is an equidigital number, since it uses as much as digits as its factorization.

3937247947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966508.

The product of its digits is 8001504, while the sum is 55.

The square root of 3937247947 is about 62747.4935515356. The cubic root of 3937247947 is about 1579.0562043589.

The spelling of 3937247947 in words is "three billion, nine hundred thirty-seven million, two hundred forty-seven thousand, nine hundred forty-seven".