1991254 has 8 divisors (see below), whose sum is σ = 3083328. Its totient is φ = 963480.

The previous prime is 1991251. The next prime is 1991267. The reversal of 1991254 is 4521991.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15997 + ... + 16120.

It is an arithmetic number, because the mean of its divisors is an integer number (385416).

2^1991254 is an apocalyptic number.

1991254 is a deficient number, since it is larger than the sum of its proper divisors (1092074).

1991254 is a wasteful number, since it uses less digits than its factorization.

1991254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32150.

The product of its digits is 3240, while the sum is 31.

The square root of 1991254 is about 1411.1179964836. The cubic root of 1991254 is about 125.8081821385.

The spelling of 1991254 in words is "one million, nine hundred ninety-one thousand, two hundred fifty-four".