1396734221977 has 4 divisors (see below), whose sum is σ = 1396832924340. Its totient is φ = 1396635519616.

The previous prime is 1396734221879. The next prime is 1396734221989. The reversal of 1396734221977 is 7791224376931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175574408256 + 1221159813721 = 419016^2 + 1105061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396734221977 - 2¹¹ = 1396734219929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396734221677) 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, 49329952 + ... + 49358257.

It is an arithmetic number, because the mean of its divisors is an integer number (349208231085).

Almost surely, 2^{1396734221977} is an apocalyptic number.

It is an amenable number.

1396734221977 is a deficient number, since it is larger than the sum of its proper divisors (98702363).

1396734221977 is an equidigital number, since it uses as much as digits as its factorization.

1396734221977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98702362.

The product of its digits is 24004512, while the sum is 61.

The spelling of 1396734221977 in words is "one trillion, three hundred ninety-six billion, seven hundred thirty-four million, two hundred twenty-one thousand, nine hundred seventy-seven".