12400919 has 4 divisors (see below), whose sum is σ = 12475344. Its totient is φ = 12326496.

The previous prime is 12400909. The next prime is 12400943. The reversal of 12400919 is 91900421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12400919 - 2²⁰ = 11352343 is a prime.

It is a super-2 number, since 2×12400919² = 307565584089122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36962 + ... + 37295.

It is an arithmetic number, because the mean of its divisors is an integer number (3118836).

Almost surely, 2^12400919 is an apocalyptic number.

12400919 is a deficient number, since it is larger than the sum of its proper divisors (74425).

12400919 is an equidigital number, since it uses as much as digits as its factorization.

12400919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74424.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 12400919 is about 3521.4938591456. The cubic root of 12400919 is about 231.4646233418.

The spelling of 12400919 in words is "twelve million, four hundred thousand, nine hundred nineteen".