12400291 has 8 divisors (see below), whose sum is σ = 12912704. Its totient is φ = 11897280.

The previous prime is 12400247. The next prime is 12400303. The reversal of 12400291 is 19200421.

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

It is a cyclic number.

It is not a de Polignac number, because 12400291 - 2¹⁷ = 12269219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12400231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406 + ... + 4996.

It is an arithmetic number, because the mean of its divisors is an integer number (1614088).

Almost surely, 2^12400291 is an apocalyptic number.

12400291 is a deficient number, since it is larger than the sum of its proper divisors (512413).

12400291 is an equidigital number, since it uses as much as digits as its factorization.

12400291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12400291 is about 3521.4046913128. The cubic root of 12400291 is about 231.4607160444.

The spelling of 12400291 in words is "twelve million, four hundred thousand, two hundred ninety-one".