3949301645 has 4 divisors (see below), whose sum is σ = 4739161980. Its totient is φ = 3159441312.

The previous prime is 3949301633. The next prime is 3949301647. The reversal of 3949301645 is 5461039493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1530530884 + 2418770761 = 39122^2 + 49181^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949301645 - 2¹² = 3949297549 is a prime.

It is a super-3 number, since 3×3949301645³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3949301596 and 3949301605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3949301647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394930160 + ... + 394930169.

It is an arithmetic number, because the mean of its divisors is an integer number (1184790495).

Almost surely, 2^3949301645 is an apocalyptic number.

It is an amenable number.

3949301645 is a deficient number, since it is larger than the sum of its proper divisors (789860335).

3949301645 is an equidigital number, since it uses as much as digits as its factorization.

3949301645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789860334.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 3949301645 is about 62843.4693902238. The cubic root of 3949301645 is about 1580.6659646521.

It can be divided in two parts, 394 and 9301645, that added together give a palindrome (9302039).

The spelling of 3949301645 in words is "three billion, nine hundred forty-nine million, three hundred one thousand, six hundred forty-five".