1978462247 has 2 divisors, whose sum is σ = 1978462248. Its totient is φ = 1978462246.

The previous prime is 1978462219. The next prime is 1978462319. The reversal of 1978462247 is 7422648791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1978462247 - 2⁶ = 1978462183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1978462195 and 1978462204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978462147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989231123 + 989231124.

It is an arithmetic number, because the mean of its divisors is an integer number (989231124).

Almost surely, 2^1978462247 is an apocalyptic number.

1978462247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978462247 is an equidigital number, since it uses as much as digits as its factorization.

1978462247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 50.

The square root of 1978462247 is about 44479.9083519739. The cubic root of 1978462247 is about 1255.3820727356.

The spelling of 1978462247 in words is "one billion, nine hundred seventy-eight million, four hundred sixty-two thousand, two hundred forty-seven".