1956396947 has 4 divisors (see below), whose sum is σ = 1956504936. Its totient is φ = 1956288960.

The previous prime is 1956396943. The next prime is 1956396979. The reversal of 1956396947 is 7496936591.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7496936591 = 10847 ⋅691153.

It is a cyclic number.

It is not a de Polignac number, because 1956396947 - 2² = 1956396943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1956396943) 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, 19454 + ... + 65507.

It is an arithmetic number, because the mean of its divisors is an integer number (489126234).

Almost surely, 2^1956396947 is an apocalyptic number.

1956396947 is a deficient number, since it is larger than the sum of its proper divisors (107989).

1956396947 is an equidigital number, since it uses as much as digits as its factorization.

1956396947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107988.

The product of its digits is 11022480, while the sum is 59.

The square root of 1956396947 is about 44231.1761882951. The cubic root of 1956396947 is about 1250.6976259420.

The spelling of 1956396947 in words is "one billion, nine hundred fifty-six million, three hundred ninety-six thousand, nine hundred forty-seven".