3947722906 has 8 divisors (see below), whose sum is σ = 5921946144. Its totient is φ = 1973740860.

The previous prime is 3947722769. The next prime is 3947722927. The reversal of 3947722906 is 6092277493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×3947722906² = 31169032285114169672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3947722906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11470 + ... + 89593.

It is an arithmetic number, because the mean of its divisors is an integer number (740243268).

Almost surely, 2^3947722906 is an apocalyptic number.

3947722906 is a deficient number, since it is larger than the sum of its proper divisors (1974223238).

3947722906 is a wasteful number, since it uses less digits than its factorization.

3947722906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120596.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The square root of 3947722906 is about 62830.9072511292. The cubic root of 3947722906 is about 1580.4553120841.

The spelling of 3947722906 in words is "three billion, nine hundred forty-seven million, seven hundred twenty-two thousand, nine hundred six".