3945273940 has 24 divisors (see below), whose sum is σ = 8345556072. Its totient is φ = 1566589440.

The previous prime is 3945273911. The next prime is 3945273949. The reversal of 3945273940 is 493725493.

It can be written as a sum of positive squares in 4 ways, for example, as 1240025796 + 2705248144 = 35214^2 + 52012^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945273949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717201 + ... + 722680.

It is an arithmetic number, because the mean of its divisors is an integer number (347731503).

Almost surely, 2^3945273940 is an apocalyptic number.

It is an amenable number.

3945273940 is an abundant number, since it is smaller than the sum of its proper divisors (4400282132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3945273940 is a wasteful number, since it uses less digits than its factorization.

3945273940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440027 (or 1440025 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 3945273940 is about 62811.4156821831. The cubic root of 3945273940 is about 1580.1284331853.

It can be divided in two parts, 3945 and 273940, that added together give a triangular number (277885 = T₇₄₅).

The spelling of 3945273940 in words is "three billion, nine hundred forty-five million, two hundred seventy-three thousand, nine hundred forty".