1891945038 has 16 divisors (see below), whose sum is σ = 3787502976. Its totient is φ = 630046200.

The previous prime is 1891945031. The next prime is 1891945039. The reversal of 1891945038 is 8305491981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891945031) 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, 143706 + ... + 156317.

It is an arithmetic number, because the mean of its divisors is an integer number (236718936).

Almost surely, 2^1891945038 is an apocalyptic number.

1891945038 is an abundant number, since it is smaller than the sum of its proper divisors (1895557938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1891945038 is a wasteful number, since it uses less digits than its factorization.

1891945038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301079.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 1891945038 is about 43496.4945484116. The cubic root of 1891945038 is about 1236.8095745065.

The spelling of 1891945038 in words is "one billion, eight hundred ninety-one million, nine hundred forty-five thousand, thirty-eight".