1340400123 has 16 divisors (see below), whose sum is σ = 1987837440. Its totient is φ = 892673352.

The previous prime is 1340400119. The next prime is 1340400143. The reversal of 1340400123 is 3210040431.

It is not a de Polignac number, because 1340400123 - 2² = 1340400119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340400096 and 1340400105.

It is not an unprimeable number, because it can be changed into a prime (1340400143) 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, 1290 + ... + 51792.

It is an arithmetic number, because the mean of its divisors is an integer number (124239840).

Almost surely, 2^1340400123 is an apocalyptic number.

1340400123 is a deficient number, since it is larger than the sum of its proper divisors (647437317).

1340400123 is an equidigital number, since it uses as much as digits as its factorization.

1340400123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51495 (or 51489 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1340400123 is about 36611.4752912253. The cubic root of 1340400123 is about 1102.5834931447.

Adding to 1340400123 its reverse (3210040431), we get a palindrome (4550440554).

The spelling of 1340400123 in words is "one billion, three hundred forty million, four hundred thousand, one hundred twenty-three".