921542 has 4 divisors (see below), whose sum is σ = 1382316. Its totient is φ = 460770.

The previous prime is 921523. The next prime is 921563. The reversal of 921542 is 245129.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921542.

It is an unprimeable number.

921542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 230384 + ... + 230387.

It is an arithmetic number, because the mean of its divisors is an integer number (345579).

2⁹²¹⁵⁴² is an apocalyptic number.

921542 is a deficient number, since it is larger than the sum of its proper divisors (460774).

921542 is a wasteful number, since it uses less digits than its factorization.

921542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460773.

The product of its digits is 720, while the sum is 23.

The square root of 921542 is about 959.9697911914. The cubic root of 921542 is about 97.3131904065.

The spelling of 921542 in words is "nine hundred twenty-one thousand, five hundred forty-two".