3921725418 has 32 divisors (see below), whose sum is σ = 8562515136. Its totient is φ = 1190153088.

The previous prime is 3921725417. The next prime is 3921725429. The reversal of 3921725418 is 8145271293.

It is a self number, because there is not a number n which added to its sum of digits gives 3921725418.

It is not an unprimeable number, because it can be changed into a prime (3921725411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338680 + ... + 350067.

It is an arithmetic number, because the mean of its divisors is an integer number (267578598).

Almost surely, 2^3921725418 is an apocalyptic number.

3921725418 is an abundant number, since it is smaller than the sum of its proper divisors (4640789718).

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

3921725418 is a wasteful number, since it uses less digits than its factorization.

3921725418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688838.

The product of its digits is 120960, while the sum is 42.

The square root of 3921725418 is about 62623.6809681449. The cubic root of 3921725418 is about 1576.9783377786.

The spelling of 3921725418 in words is "three billion, nine hundred twenty-one million, seven hundred twenty-five thousand, four hundred eighteen".