3078721 has 2 divisors, whose sum is σ = 3078722. Its totient is φ = 3078720.

The previous prime is 3078689. The next prime is 3078737. The reversal of 3078721 is 1278703.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 65025 = 1736^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 3078721 - 2⁵ = 3078689 is a prime.

It is an alternating number because its digits alternate between odd and even.

3078721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3078721.

It is not a weakly prime, because it can be changed into another prime (3078781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1539360 + 1539361.

It is an arithmetic number, because the mean of its divisors is an integer number (1539361).

Almost surely, 2^3078721 is an apocalyptic number.

It is an amenable number.

3078721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3078721 is an equidigital number, since it uses as much as digits as its factorization.

3078721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 3078721 is about 1754.6284506983. The cubic root of 3078721 is about 145.4755846815.

The spelling of 3078721 in words is "three million, seventy-eight thousand, seven hundred twenty-one".