3891545 has 8 divisors (see below), whose sum is σ = 5337024. Its totient is φ = 2668464.

The previous prime is 3891541. The next prime is 3891551. The reversal of 3891545 is 5451983.

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

It is a cyclic number.

It is not a de Polignac number, because 3891545 - 2² = 3891541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 111187 = 3891545 / (3 + 8 + 9 + 1 + 5 + 4 + 5).

It is not an unprimeable number, because it can be changed into a prime (3891541) 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, 55559 + ... + 55628.

It is an arithmetic number, because the mean of its divisors is an integer number (667128).

Almost surely, 2^3891545 is an apocalyptic number.

3891545 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3891545 is a deficient number, since it is larger than the sum of its proper divisors (1445479).

3891545 is a wasteful number, since it uses less digits than its factorization.

3891545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111199.

The product of its digits is 21600, while the sum is 35.

The square root of 3891545 is about 1972.6999264967. The cubic root of 3891545 is about 157.2922599181.

The spelling of 3891545 in words is "three million, eight hundred ninety-one thousand, five hundred forty-five".