1381272994 has 4 divisors (see below), whose sum is σ = 2071909494. Its totient is φ = 690636496.

The previous prime is 1381272947. The next prime is 1381273009. The reversal of 1381272994 is 4992721831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4992721831 = 541 ⋅9228691.

It can be written as a sum of positive squares in only one way, i.e., 1158517369 + 222755625 = 34037^2 + 14925^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345318247 + ... + 345318250.

Almost surely, 2^1381272994 is an apocalyptic number.

1381272994 is a deficient number, since it is larger than the sum of its proper divisors (690636500).

1381272994 is an equidigital number, since it uses as much as digits as its factorization.

1381272994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690636499.

The product of its digits is 217728, while the sum is 46.

The square root of 1381272994 is about 37165.4812157733. The cubic root of 1381272994 is about 1113.6785121582.

The spelling of 1381272994 in words is "one billion, three hundred eighty-one million, two hundred seventy-two thousand, nine hundred ninety-four".