1723149 has 6 divisors (see below), whose sum is σ = 2489006. Its totient is φ = 1148760.

The previous prime is 1723147. The next prime is 1723177. The reversal of 1723149 is 9413271.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 59049 = 1290^2 + 243^2 .

It is not a de Polignac number, because 1723149 - 2¹ = 1723147 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1723147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95722 + ... + 95739.

2^1723149 is an apocalyptic number.

It is an amenable number.

1723149 is a deficient number, since it is larger than the sum of its proper divisors (765857).

1723149 is a wasteful number, since it uses less digits than its factorization.

1723149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191467 (or 191464 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1723149 is about 1312.6877008641. The cubic root of 1723149 is about 119.8876030907.

It can be divided in two parts, 172 and 3149, that added together give a triangular number (3321 = T₈₁).

The spelling of 1723149 in words is "one million, seven hundred twenty-three thousand, one hundred forty-nine".