2978506 has 4 divisors (see below), whose sum is σ = 4467762. Its totient is φ = 1489252.

The previous prime is 2978501. The next prime is 2978533. The reversal of 2978506 is 6058792.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2859481 + 119025 = 1691^2 + 345^2 .

It is not an unprimeable number, because it can be changed into a prime (2978501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744625 + ... + 744628.

2^2978506 is an apocalyptic number.

2978506 is a deficient number, since it is larger than the sum of its proper divisors (1489256).

2978506 is a wasteful number, since it uses less digits than its factorization.

2978506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489255.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 2978506 is about 1725.8348704323. The cubic root of 2978506 is about 143.8796898911.

The spelling of 2978506 in words is "two million, nine hundred seventy-eight thousand, five hundred six".