3980139840 has 84 divisors (see below), whose sum is σ = 13690032564. Its totient is φ = 1061369856.

The previous prime is 3980139803. The next prime is 3980139847. The reversal of 3980139840 is 489310893.

It can be written as a sum of positive squares in 2 ways, for example, as 1297728576 + 2682411264 = 36024^2 + 51792^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3980139847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 688117 + ... + 693876.

Almost surely, 2^3980139840 is an apocalyptic number.

3980139840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3980139840 is an abundant number, since it is smaller than the sum of its proper divisors (9709892724).

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

3980139840 is a wasteful number, since it uses less digits than its factorization.

3980139840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382016 (or 1382003 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 3980139840 is about 63088.3494791233. The cubic root of 3980139840 is about 1584.7695220274.

The spelling of 3980139840 in words is "three billion, nine hundred eighty million, one hundred thirty-nine thousand, eight hundred forty".