3972545 has 4 divisors (see below), whose sum is σ = 4767060. Its totient is φ = 3178032.

The previous prime is 3972541. The next prime is 3972569. The reversal of 3972545 is 5452793.

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 1256641 + 2715904 = 1121^2 + 1648^2 .

It is a cyclic number.

It is not a de Polignac number, because 3972545 - 2² = 3972541 is a prime.

It is a super-2 number, since 2×3972545² = 31562227554050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3972541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397250 + ... + 397259.

It is an arithmetic number, because the mean of its divisors is an integer number (1191765).

Almost surely, 2^3972545 is an apocalyptic number.

It is an amenable number.

3972545 is a deficient number, since it is larger than the sum of its proper divisors (794515).

3972545 is an equidigital number, since it uses as much as digits as its factorization.

3972545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794514.

The product of its digits is 37800, while the sum is 35.

The square root of 3972545 is about 1993.1244316399. The cubic root of 3972545 is about 158.3760869464.

The spelling of 3972545 in words is "three million, nine hundred seventy-two thousand, five hundred forty-five".