1231378894 has 4 divisors (see below), whose sum is σ = 1847068344. Its totient is φ = 615689446.

The previous prime is 1231378891. The next prime is 1231378921. The reversal of 1231378894 is 4988731321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4988731321 = 7 ⋅712675903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231378891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307844722 + ... + 307844725.

It is an arithmetic number, because the mean of its divisors is an integer number (461767086).

Almost surely, 2^1231378894 is an apocalyptic number.

1231378894 is a deficient number, since it is larger than the sum of its proper divisors (615689450).

1231378894 is an equidigital number, since it uses as much as digits as its factorization.

1231378894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615689449.

The product of its digits is 290304, while the sum is 46.

The square root of 1231378894 is about 35091.0087344322. The cubic root of 1231378894 is about 1071.8415006391.

The spelling of 1231378894 in words is "one billion, two hundred thirty-one million, three hundred seventy-eight thousand, eight hundred ninety-four".