3921745 has 4 divisors (see below), whose sum is σ = 4706100. Its totient is φ = 3137392.

The previous prime is 3921721. The next prime is 3921761. The reversal of 3921745 is 5471293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5471293 = 157 ⋅34849.

It can be written as a sum of positive squares in 2 ways, for example, as 638401 + 3283344 = 799^2 + 1812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3921745 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392170 + ... + 392179.

It is an arithmetic number, because the mean of its divisors is an integer number (1176525).

Almost surely, 2^3921745 is an apocalyptic number.

It is an amenable number.

3921745 is a deficient number, since it is larger than the sum of its proper divisors (784355).

3921745 is an equidigital number, since it uses as much as digits as its factorization.

3921745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784354.

The product of its digits is 7560, while the sum is 31.

The square root of 3921745 is about 1980.3396173384. The cubic root of 3921745 is about 157.6980962502.

The spelling of 3921745 in words is "three million, nine hundred twenty-one thousand, seven hundred forty-five".