1901992 has 8 divisors (see below), whose sum is σ = 3566250. Its totient is φ = 950992.

The previous prime is 1901987. The next prime is 1901993. The reversal of 1901992 is 2991091.

It can be written as a sum of positive squares in only one way, i.e., 1572516 + 329476 = 1254^2 + 574^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (1901993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118867 + ... + 118882.

2^1901992 is an apocalyptic number.

It is an amenable number.

1901992 is a deficient number, since it is larger than the sum of its proper divisors (1664258).

1901992 is a wasteful number, since it uses less digits than its factorization.

1901992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237755 (or 237751 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1901992 is about 1379.1272602628. The cubic root of 1901992 is about 123.8995023391.

The spelling of 1901992 in words is "one million, nine hundred one thousand, nine hundred ninety-two".