1938742455 has 16 divisors (see below), whose sum is σ = 3340602720. Its totient is φ = 954457728.

The previous prime is 1938742453. The next prime is 1938742457. The reversal of 1938742455 is 5542478391.

It is an interprime number because it is at equal distance from previous prime (1938742453) and next prime (1938742457).

It is not a de Polignac number, because 1938742455 - 2¹ = 1938742453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938742451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4970940 + ... + 4971329.

It is an arithmetic number, because the mean of its divisors is an integer number (208787670).

Almost surely, 2^1938742455 is an apocalyptic number.

1938742455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1938742455 is a deficient number, since it is larger than the sum of its proper divisors (1401860265).

1938742455 is a wasteful number, since it uses less digits than its factorization.

1938742455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942290.

The product of its digits is 1209600, while the sum is 48.

The square root of 1938742455 is about 44031.1532326829. The cubic root of 1938742455 is about 1246.9241613144.

The spelling of 1938742455 in words is "one billion, nine hundred thirty-eight million, seven hundred forty-two thousand, four hundred fifty-five".