3891957949 has 8 divisors (see below), whose sum is σ = 4430371392. Its totient is φ = 3384311040.

The previous prime is 3891957931. The next prime is 3891957959. The reversal of 3891957949 is 9497591983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3891957949 - 2¹⁹ = 3891433661 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 (3891957959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7691364 + ... + 7691869.

It is an arithmetic number, because the mean of its divisors is an integer number (553796424).

Almost surely, 2^3891957949 is an apocalyptic number.

It is an amenable number.

3891957949 is a deficient number, since it is larger than the sum of its proper divisors (538413443).

3891957949 is a wasteful number, since it uses less digits than its factorization.

3891957949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15383267.

The product of its digits is 22044960, while the sum is 64.

The square root of 3891957949 is about 62385.5588177264. The cubic root of 3891957949 is about 1572.9782337978.

The spelling of 3891957949 in words is "three billion, eight hundred ninety-one million, nine hundred fifty-seven thousand, nine hundred forty-nine".