3949981540 has 24 divisors (see below), whose sum is σ = 8580995640. Its totient is φ = 1525509888.

The previous prime is 3949981513. The next prime is 3949981547. The reversal of 3949981540 is 451899493.

It can be written as a sum of positive squares in 4 ways, for example, as 1604322916 + 2345658624 = 40054^2 + 48432^2 .

It is not an unprimeable number, because it can be changed into a prime (3949981547) 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, 3404577 + ... + 3405736.

It is an arithmetic number, because the mean of its divisors is an integer number (357541485).

Almost surely, 2^3949981540 is an apocalyptic number.

It is an amenable number.

3949981540 is an abundant number, since it is smaller than the sum of its proper divisors (4631014100).

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

3949981540 is a wasteful number, since it uses less digits than its factorization.

3949981540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810351 (or 6810349 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 3949981540 is about 62848.8785898364. The cubic root of 3949981540 is about 1580.7566663607.

The spelling of 3949981540 in words is "three billion, nine hundred forty-nine million, nine hundred eighty-one thousand, five hundred forty".