140821573 has 4 divisors (see below), whose sum is σ = 142215948. Its totient is φ = 139427200.

The previous prime is 140821547. The next prime is 140821607. The reversal of 140821573 is 375128041.

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

It can be written as a sum of positive squares in 2 ways, for example, as 95218564 + 45603009 = 9758^2 + 6753^2 .

It is a cyclic number.

It is not a de Polignac number, because 140821573 - 2¹³ = 140813381 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140821273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697036 + ... + 697237.

It is an arithmetic number, because the mean of its divisors is an integer number (35553987).

Almost surely, 2^140821573 is an apocalyptic number.

It is an amenable number.

140821573 is a deficient number, since it is larger than the sum of its proper divisors (1394375).

140821573 is a wasteful number, since it uses less digits than its factorization.

140821573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394374.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 140821573 is about 11866.8265766379. The cubic root of 140821573 is about 520.2631471368.

The spelling of 140821573 in words is "one hundred forty million, eight hundred twenty-one thousand, five hundred seventy-three".