1378939724 has 6 divisors (see below), whose sum is σ = 2413144524. Its totient is φ = 689469860.

The previous prime is 1378939703. The next prime is 1378939729. The reversal of 1378939724 is 4279398731.

It is not an unprimeable number, because it can be changed into a prime (1378939729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172367462 + ... + 172367469.

It is an arithmetic number, because the mean of its divisors is an integer number (402190754).

Almost surely, 2^1378939724 is an apocalyptic number.

It is an amenable number.

1378939724 is a deficient number, since it is larger than the sum of its proper divisors (1034204800).

1378939724 is a wasteful number, since it uses less digits than its factorization.

1378939724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344734935 (or 344734933 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 53.

The square root of 1378939724 is about 37134.0776645927. The cubic root of 1378939724 is about 1113.0510771281.

The spelling of 1378939724 in words is "one billion, three hundred seventy-eight million, nine hundred thirty-nine thousand, seven hundred twenty-four".