13893214978 has 4 divisors (see below), whose sum is σ = 20839822470. Its totient is φ = 6946607488.

The previous prime is 13893214961. The next prime is 13893214981. The reversal of 13893214978 is 87941239831.

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: 87941239831 = 1193 ⋅73714367.

It can be written as a sum of positive squares in only one way, i.e., 8145604009 + 5747610969 = 90253^2 + 75813^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3473303743 + ... + 3473303746.

Almost surely, 2^13893214978 is an apocalyptic number.

13893214978 is a deficient number, since it is larger than the sum of its proper divisors (6946607492).

13893214978 is an equidigital number, since it uses as much as digits as its factorization.

13893214978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6946607491.

The product of its digits is 2612736, while the sum is 55.

The spelling of 13893214978 in words is "thirteen billion, eight hundred ninety-three million, two hundred fourteen thousand, nine hundred seventy-eight".