2978775 has 30 divisors (see below), whose sum is σ = 5521472. Its totient is φ = 1587600.

The previous prime is 2978771. The next prime is 2978783. The reversal of 2978775 is 5778792.

It is not a de Polignac number, because 2978775 - 2² = 2978771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2978775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978771) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1290 + ... + 2760.

2^2978775 is an apocalyptic number.

2978775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2978775 is a deficient number, since it is larger than the sum of its proper divisors (2542697).

2978775 is a wasteful number, since it uses less digits than its factorization.

2978775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1479 counting only the distinct ones).

The product of its digits is 246960, while the sum is 45.

The square root of 2978775 is about 1725.9128019689. The cubic root of 2978775 is about 143.8840211981.

The spelling of 2978775 in words is "two million, nine hundred seventy-eight thousand, seven hundred seventy-five".