2978545 has 4 divisors (see below), whose sum is σ = 3574260. Its totient is φ = 2382832.

The previous prime is 2978543. The next prime is 2978551. The reversal of 2978545 is 5458792.

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 2211169 + 767376 = 1487^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 2978545 - 2¹ = 2978543 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2978498 and 2978507.

It is not an unprimeable number, because it can be changed into a prime (2978543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297850 + ... + 297859.

It is an arithmetic number, because the mean of its divisors is an integer number (893565).

2^2978545 is an apocalyptic number.

It is an amenable number.

2978545 is a deficient number, since it is larger than the sum of its proper divisors (595715).

2978545 is an equidigital number, since it uses as much as digits as its factorization.

2978545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595714.

The product of its digits is 100800, while the sum is 40.

The square root of 2978545 is about 1725.8461692747. The cubic root of 2978545 is about 143.8803178663.

The spelling of 2978545 in words is "two million, nine hundred seventy-eight thousand, five hundred forty-five".