2778172 has 12 divisors (see below), whose sum is σ = 4892776. Its totient is φ = 1380240.

The previous prime is 2778151. The next prime is 2778173. The reversal of 2778172 is 2718772.

It is a super-3 number, since 3×2778172³ = 64327791951306433344, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778173) 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, 1479 + ... + 2782.

2^2778172 is an apocalyptic number.

It is an amenable number.

2778172 is a deficient number, since it is larger than the sum of its proper divisors (2114604).

2778172 is a wasteful number, since it uses less digits than its factorization.

2778172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428 (or 4426 counting only the distinct ones).

The product of its digits is 10976, while the sum is 34.

The square root of 2778172 is about 1666.7849291375. The cubic root of 2778172 is about 140.5787605671.

The spelling of 2778172 in words is "two million, seven hundred seventy-eight thousand, one hundred seventy-two".