1378473457 has 2 divisors, whose sum is σ = 1378473458. Its totient is φ = 1378473456.

The previous prime is 1378473401. The next prime is 1378473469. The reversal of 1378473457 is 7543748731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364268096 + 14205361 = 36936^2 + 3769^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378473457 - 2²⁷ = 1244255729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378473457.

It is not a weakly prime, because it can be changed into another prime (1378473557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689236728 + 689236729.

It is an arithmetic number, because the mean of its divisors is an integer number (689236729).

Almost surely, 2^1378473457 is an apocalyptic number.

It is an amenable number.

1378473457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378473457 is an equidigital number, since it uses as much as digits as its factorization.

1378473457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 49.

The square root of 1378473457 is about 37127.7989786629. The cubic root of 1378473457 is about 1112.9256093543.

The spelling of 1378473457 in words is "one billion, three hundred seventy-eight million, four hundred seventy-three thousand, four hundred fifty-seven".