3899128249 has 9 divisors (see below), whose sum is σ = 3999174319. Its totient is φ = 3801529840.

The previous prime is 3899128231. The next prime is 3899128253. The reversal of 3899128249 is 9428219983.

The square root of 3899128249 is 62443.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 187881849 + 3711246400 = 13707^2 + 60920^2 .

It is not a de Polignac number, because 3899128249 - 2²³ = 3890739641 is a prime.

It is a super-2 number, since 2×3899128249² = 30406402204299612002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3899128249.

It is not an unprimeable number, because it can be changed into a prime (3899128949) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2559402 + ... + 2560924.

Almost surely, 2^3899128249 is an apocalyptic number.

3899128249 is the 62443-rd square number.

3899128249 is the 31222-nd centered octagonal number.

It is an amenable number.

3899128249 is a deficient number, since it is larger than the sum of its proper divisors (100046070).

3899128249 is an frugal number, since it uses more digits than its factorization.

3899128249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 1564 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The cubic root of 3899128249 is about 1573.9436267656.

It can be divided in two parts, 389912 and 8249, that added together give a square (398161 = 631²).

The spelling of 3899128249 in words is "three billion, eight hundred ninety-nine million, one hundred twenty-eight thousand, two hundred forty-nine".