1378400747 has 4 divisors (see below), whose sum is σ = 1379380440. Its totient is φ = 1377421056.

The previous prime is 1378400743. The next prime is 1378400767. The reversal of 1378400747 is 7470048731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7470048731 = 7561 ⋅987971.

It is a cyclic number.

It is not a de Polignac number, because 1378400747 - 2² = 1378400743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378400743) 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, 487733 + ... + 490550.

It is an arithmetic number, because the mean of its divisors is an integer number (344845110).

Almost surely, 2^1378400747 is an apocalyptic number.

1378400747 is a deficient number, since it is larger than the sum of its proper divisors (979693).

1378400747 is an equidigital number, since it uses as much as digits as its factorization.

1378400747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979692.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 1378400747 is about 37126.8197803151. The cubic root of 1378400747 is about 1112.9060412725.

The spelling of 1378400747 in words is "one billion, three hundred seventy-eight million, four hundred thousand, seven hundred forty-seven".