1901816 has 16 divisors (see below), whose sum is σ = 4075440. Its totient is φ = 815040.

The previous prime is 1901803. The next prime is 1901831. The reversal of 1901816 is 6181091.

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, 16925 + ... + 17036.

It is an arithmetic number, because the mean of its divisors is an integer number (254715).

2^1901816 is an apocalyptic number.

It is an amenable number.

1901816 is an abundant number, since it is smaller than the sum of its proper divisors (2173624).

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

1901816 is a wasteful number, since it uses less digits than its factorization.

1901816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33974 (or 33970 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1901816 is about 1379.0634503169. The cubic root of 1901816 is about 123.8956805591.

Subtracting 1901816 from its reverse (6181091), we obtain a triangular number (4279275 = T₂₉₂₅).

The spelling of 1901816 in words is "one million, nine hundred one thousand, eight hundred sixteen".