1378025638 has 16 divisors (see below), whose sum is σ = 2266404624. Its totient is φ = 623193760.

The previous prime is 1378025629. The next prime is 1378025639. The reversal of 1378025638 is 8365208731.

It is a junction number, because it is equal to n+sod(n) for n = 1378025594 and 1378025603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378025639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154645 + ... + 163312.

It is an arithmetic number, because the mean of its divisors is an integer number (141650289).

Almost surely, 2^1378025638 is an apocalyptic number.

1378025638 is a deficient number, since it is larger than the sum of its proper divisors (888378986).

1378025638 is a wasteful number, since it uses less digits than its factorization.

1378025638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318167.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1378025638 is about 37121.7677111422. The cubic root of 1378025638 is about 1112.8050791135.

The spelling of 1378025638 in words is "one billion, three hundred seventy-eight million, twenty-five thousand, six hundred thirty-eight".