1992091 has 8 divisors (see below), whose sum is σ = 2073600. Its totient is φ = 1911720.

The previous prime is 1992079. The next prime is 1992101. The reversal of 1992091 is 1902991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1992091 - 2⁷ = 1991963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

1992091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1992031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5370 + ... + 5728.

It is an arithmetic number, because the mean of its divisors is an integer number (259200).

2^1992091 is an apocalyptic number.

1992091 is a deficient number, since it is larger than the sum of its proper divisors (81509).

1992091 is a wasteful number, since it uses less digits than its factorization.

1992091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569.

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

The square root of 1992091 is about 1411.4145386810. The cubic root of 1992091 is about 125.8258069949.

1992091 divided by its sum of digits (31) gives a triangular number (64261 = T₃₅₈).

The spelling of 1992091 in words is "one million, nine hundred ninety-two thousand, ninety-one".