1320401947 has 2 divisors, whose sum is σ = 1320401948. Its totient is φ = 1320401946.

The previous prime is 1320401923. The next prime is 1320401969. The reversal of 1320401947 is 7491040231.

It is a strong prime.

It is an emirp because it is prime and its reverse (7491040231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320401947 - 2¹⁹ = 1319877659 is a prime.

It is a super-2 number, since 2×1320401947² = 3486922603282781618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1320401977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660200973 + 660200974.

It is an arithmetic number, because the mean of its divisors is an integer number (660200974).

Almost surely, 2^1320401947 is an apocalyptic number.

1320401947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320401947 is an equidigital number, since it uses as much as digits as its factorization.

1320401947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1320401947 is about 36337.3354416639. The cubic root of 1320401947 is about 1097.0726426990.

The spelling of 1320401947 in words is "one billion, three hundred twenty million, four hundred one thousand, nine hundred forty-seven".