3945771890 has 32 divisors (see below), whose sum is σ = 7200092160. Its totient is φ = 1556743104.

The previous prime is 3945771889. The next prime is 3945771901. The reversal of 3945771890 is 981775493.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210731 + ... + 228689.

It is an arithmetic number, because the mean of its divisors is an integer number (225002880).

Almost surely, 2^3945771890 is an apocalyptic number.

3945771890 is a deficient number, since it is larger than the sum of its proper divisors (3254320270).

3945771890 is a wasteful number, since it uses less digits than its factorization.

3945771890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18266.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 3945771890 is about 62815.3794066389. The cubic root of 3945771890 is about 1580.1949086582.

The spelling of 3945771890 in words is "three billion, nine hundred forty-five million, seven hundred seventy-one thousand, eight hundred ninety".