1901812 has 12 divisors (see below), whose sum is σ = 3630816. Its totient is φ = 864440.

The previous prime is 1901803. The next prime is 1901831. The reversal of 1901812 is 2181091.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21568 + ... + 21655.

It is an arithmetic number, because the mean of its divisors is an integer number (302568).

2^1901812 is an apocalyptic number.

It is an amenable number.

1901812 is a deficient number, since it is larger than the sum of its proper divisors (1729004).

1901812 is a wasteful number, since it uses less digits than its factorization.

1901812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43238 (or 43236 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1901812 is about 1379.0620000566. The cubic root of 1901812 is about 123.8955936977.

It can be divided in two parts, 190 and 1812, that added together give a palindrome (2002).

The spelling of 1901812 in words is "one million, nine hundred one thousand, eight hundred twelve".