3972198949 has 4 divisors (see below), whose sum is σ = 3985756236. Its totient is φ = 3958641664.

The previous prime is 3972198947. The next prime is 3972198953. The reversal of 3972198949 is 9498912793.

3972198949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9498912793 = 29 ⋅327548717.

It can be written as a sum of positive squares in 2 ways, for example, as 3506416225 + 465782724 = 59215^2 + 21582^2 .

It is a cyclic number.

It is not a de Polignac number, because 3972198949 - 2¹ = 3972198947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972198947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6778204 + ... + 6778789.

It is an arithmetic number, because the mean of its divisors is an integer number (996439059).

Almost surely, 2^3972198949 is an apocalyptic number.

It is an amenable number.

3972198949 is a deficient number, since it is larger than the sum of its proper divisors (13557287).

3972198949 is a wasteful number, since it uses less digits than its factorization.

3972198949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13557286.

The product of its digits is 8817984, while the sum is 61.

The square root of 3972198949 is about 63025.3833705119. The cubic root of 3972198949 is about 1583.7148806455.

The spelling of 3972198949 in words is "three billion, nine hundred seventy-two million, one hundred ninety-eight thousand, nine hundred forty-nine".