12155722 has 4 divisors (see below), whose sum is σ = 18233586. Its totient is φ = 6077860.

The previous prime is 12155677. The next prime is 12155723. The reversal of 12155722 is 22755121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22755121 = 557 ⋅40853.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 4084441 = 2841^2 + 2021^2 .

It is not an unprimeable number, because it can be changed into a prime (12155723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3038929 + ... + 3038932.

Almost surely, 2^12155722 is an apocalyptic number.

12155722 is a deficient number, since it is larger than the sum of its proper divisors (6077864).

12155722 is an equidigital number, since it uses as much as digits as its factorization.

12155722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6077863.

The product of its digits is 1400, while the sum is 25.

The square root of 12155722 is about 3486.5057005546. The cubic root of 12155722 is about 229.9289131289.

The spelling of 12155722 in words is "twelve million, one hundred fifty-five thousand, seven hundred twenty-two".