12400761 has 4 divisors (see below), whose sum is σ = 16534352. Its totient is φ = 8267172.

The previous prime is 12400757. The next prime is 12400793. The reversal of 12400761 is 16700421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16700421 = 3 ⋅5566807.

It is not a de Polignac number, because 12400761 - 2² = 12400757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12400721) 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, 2066791 + ... + 2066796.

It is an arithmetic number, because the mean of its divisors is an integer number (4133588).

Almost surely, 2^12400761 is an apocalyptic number.

It is an amenable number.

12400761 is a deficient number, since it is larger than the sum of its proper divisors (4133591).

12400761 is an equidigital number, since it uses as much as digits as its factorization.

12400761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133590.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 12400761 is about 3521.4714254130. The cubic root of 12400761 is about 231.4636403081.

The spelling of 12400761 in words is "twelve million, four hundred thousand, seven hundred sixty-one".