1901917923 has 16 divisors (see below), whose sum is σ = 2583110400. Its totient is φ = 1244406240.

The previous prime is 1901917903. The next prime is 1901917931. The reversal of 1901917923 is 3297191091.

It is not a de Polignac number, because 1901917923 - 2¹⁷ = 1901786851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1901917903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103173 + ... + 120201.

It is an arithmetic number, because the mean of its divisors is an integer number (161444400).

Almost surely, 2^1901917923 is an apocalyptic number.

1901917923 is a deficient number, since it is larger than the sum of its proper divisors (681192477).

1901917923 is a wasteful number, since it uses less digits than its factorization.

1901917923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17722.

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 1901917923 is about 43610.9839719307. The cubic root of 1901917923 is about 1238.9789381100.

The spelling of 1901917923 in words is "one billion, nine hundred one million, nine hundred seventeen thousand, nine hundred twenty-three".