1901895 has 16 divisors (see below), whose sum is σ = 3075072. Its totient is φ = 1003680.

The previous prime is 1901891. The next prime is 1901897. The reversal of 1901895 is 5981091.

It is not a de Polignac number, because 1901895 - 2² = 1901891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901891) 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, 930 + ... + 2160.

It is an arithmetic number, because the mean of its divisors is an integer number (192192).

2^1901895 is an apocalyptic number.

1901895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1901895 is a deficient number, since it is larger than the sum of its proper divisors (1173177).

1901895 is a wasteful number, since it uses less digits than its factorization.

1901895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1901895 is about 1379.0920926465. The cubic root of 1901895 is about 123.8973960463.

The spelling of 1901895 in words is "one million, nine hundred one thousand, eight hundred ninety-five".