12152778 has 16 divisors (see below), whose sum is σ = 26515296. Its totient is φ = 3682640.

The previous prime is 12152753. The next prime is 12152783. The reversal of 12152778 is 87725121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92001 + ... + 92132.

It is an arithmetic number, because the mean of its divisors is an integer number (1657206).

Almost surely, 2^12152778 is an apocalyptic number.

12152778 is an abundant number, since it is smaller than the sum of its proper divisors (14362518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12152778 is a wasteful number, since it uses less digits than its factorization.

12152778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184149.

The product of its digits is 7840, while the sum is 33.

The square root of 12152778 is about 3486.0834757647. The cubic root of 12152778 is about 229.9103494331.

Adding to 12152778 its reverse (87725121), we get a palindrome (99877899).

It can be divided in two parts, 1215 and 2778, that added together give a palindrome (3993).

The spelling of 12152778 in words is "twelve million, one hundred fifty-two thousand, seven hundred seventy-eight".