1938791001 has 16 divisors (see below), whose sum is σ = 2955049344. Its totient is φ = 1107617664.

The previous prime is 1938790991. The next prime is 1938791011. The reversal of 1938791001 is 1001978391.

It is an interprime number because it is at equal distance from previous prime (1938790991) and next prime (1938791011).

It is not a de Polignac number, because 1938791001 - 2⁷ = 1938790873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1938791011) 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, 111445 + ... + 127661.

It is an arithmetic number, because the mean of its divisors is an integer number (184690584).

Almost surely, 2^1938791001 is an apocalyptic number.

It is an amenable number.

1938791001 is a deficient number, since it is larger than the sum of its proper divisors (1016258343).

1938791001 is a wasteful number, since it uses less digits than its factorization.

1938791001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21920.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 1938791001 is about 44031.7044980092. The cubic root of 1938791001 is about 1246.9345688641.

The spelling of 1938791001 in words is "one billion, nine hundred thirty-eight million, seven hundred ninety-one thousand, one".