1948143638 has 32 divisors (see below), whose sum is σ = 3434897664. Its totient is φ = 811312992.

The previous prime is 1948143629. The next prime is 1948143649. The reversal of 1948143638 is 8363418491.

It is a junction number, because it is equal to n+sod(n) for n = 1948143592 and 1948143601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110381 + ... + 126807.

It is an arithmetic number, because the mean of its divisors is an integer number (107340552).

Almost surely, 2^1948143638 is an apocalyptic number.

1948143638 is a deficient number, since it is larger than the sum of its proper divisors (1486754026).

1948143638 is a wasteful number, since it uses less digits than its factorization.

1948143638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16676.

The product of its digits is 497664, while the sum is 47.

The square root of 1948143638 is about 44137.7801662023. The cubic root of 1948143638 is about 1248.9364047087.

The spelling of 1948143638 in words is "one billion, nine hundred forty-eight million, one hundred forty-three thousand, six hundred thirty-eight".