890997493 has 4 divisors (see below), whose sum is σ = 891719020. Its totient is φ = 890275968.

The previous prime is 890997463. The next prime is 890997509. The reversal of 890997493 is 394799098.

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 584817489 + 306180004 = 24183^2 + 17498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-890997493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (890997403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358908 + ... + 361381.

It is an arithmetic number, because the mean of its divisors is an integer number (222929755).

Almost surely, 2^890997493 is an apocalyptic number.

It is an amenable number.

890997493 is a deficient number, since it is larger than the sum of its proper divisors (721527).

890997493 is a wasteful number, since it uses less digits than its factorization.

890997493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721526.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The square root of 890997493 is about 29849.5811193390. The cubic root of 890997493 is about 962.2593964964.

The spelling of 890997493 in words is "eight hundred ninety million, nine hundred ninety-seven thousand, four hundred ninety-three".