3721391898 has 24 divisors (see below), whose sum is σ = 8506942368. Its totient is φ = 1063141872.

The previous prime is 3721391893. The next prime is 3721391899. The reversal of 3721391898 is 8981931273.

It is a self number, because there is not a number n which added to its sum of digits gives 3721391898.

It is not an unprimeable number, because it can be changed into a prime (3721391893) 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, 390640 + ... + 400052.

It is an arithmetic number, because the mean of its divisors is an integer number (354455932).

Almost surely, 2^3721391898 is an apocalyptic number.

3721391898 is an abundant number, since it is smaller than the sum of its proper divisors (4785550470).

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

3721391898 is an frugal number, since it uses more digits than its factorization.

3721391898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18838 (or 9425 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 3721391898 is about 61003.2121941132. The cubic root of 3721391898 is about 1549.6554069899.

The spelling of 3721391898 in words is "three billion, seven hundred twenty-one million, three hundred ninety-one thousand, eight hundred ninety-eight".