890437649 has 4 divisors (see below), whose sum is σ = 891331764. Its totient is φ = 889543536.

The previous prime is 890437643. The next prime is 890437657. The reversal of 890437649 is 946734098.

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 588790225 + 301647424 = 24265^2 + 17368^2 .

It is a cyclic number.

It is not a de Polignac number, because 890437649 - 2⁴ = 890437633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 890437597 and 890437606.

It is not an unprimeable number, because it can be changed into a prime (890437643) 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, 445562 + ... + 447555.

It is an arithmetic number, because the mean of its divisors is an integer number (222832941).

Almost surely, 2^890437649 is an apocalyptic number.

It is an amenable number.

890437649 is a deficient number, since it is larger than the sum of its proper divisors (894115).

890437649 is an equidigital number, since it uses as much as digits as its factorization.

890437649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894114.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 890437649 is about 29840.2018927486. The cubic root of 890437649 is about 962.0578141784.

The spelling of 890437649 in words is "eight hundred ninety million, four hundred thirty-seven thousand, six hundred forty-nine".