2278406 has 8 divisors (see below), whose sum is σ = 3680544. Its totient is φ = 1051560.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278406 is 6048722.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2278406² = 10382267801672, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43790 + ... + 43841.

It is an arithmetic number, because the mean of its divisors is an integer number (460068).

2^2278406 is an apocalyptic number.

2278406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2278406 is a deficient number, since it is larger than the sum of its proper divisors (1402138).

2278406 is a wasteful number, since it uses less digits than its factorization.

2278406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87646.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 2278406 is about 1509.4389686238. The cubic root of 2278406 is about 131.5862080316.

The spelling of 2278406 in words is "two million, two hundred seventy-eight thousand, four hundred six".