12402291 has 16 divisors (see below), whose sum is σ = 18120960. Its totient is φ = 7482720.

The previous prime is 12402287. The next prime is 12402293. The reversal of 12402291 is 19220421.

It is not a de Polignac number, because 12402291 - 2² = 12402287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12402293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7965 + ... + 9393.

It is an arithmetic number, because the mean of its divisors is an integer number (1132560).

Almost surely, 2^12402291 is an apocalyptic number.

12402291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12402291 is a deficient number, since it is larger than the sum of its proper divisors (5718669).

12402291 is a wasteful number, since it uses less digits than its factorization.

12402291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12402291 is about 3521.6886574483. The cubic root of 12402291 is about 231.4731592079.

The spelling of 12402291 in words is "twelve million, four hundred two thousand, two hundred ninety-one".