720149 has 4 divisors (see below), whose sum is σ = 726636. Its totient is φ = 713664.

The previous prime is 720133. The next prime is 720151. The reversal of 720149 is 941027.

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 255025 + 465124 = 505^2 + 682^2 .

It is a cyclic number.

It is not a de Polignac number, because 720149 - 2⁴ = 720133 is a prime.

It is a super-2 number, since 2×720149² = 1037229164402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720179) 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, 3074 + ... + 3299.

It is an arithmetic number, because the mean of its divisors is an integer number (181659).

2⁷²⁰¹⁴⁹ is an apocalyptic number.

It is an amenable number.

720149 is a deficient number, since it is larger than the sum of its proper divisors (6487).

720149 is a wasteful number, since it uses less digits than its factorization.

720149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6486.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 720149 is about 848.6159319739. The cubic root of 720149 is about 89.6342771835.

The spelling of 720149 in words is "seven hundred twenty thousand, one hundred forty-nine".