1723997340 has 144 divisors (see below), whose sum is σ = 5645124576. Its totient is φ = 423360000.

The previous prime is 1723997333. The next prime is 1723997347. The reversal of 1723997340 is 437993271.

It is an interprime number because it is at equal distance from previous prime (1723997333) and next prime (1723997347).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1723997347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1639815 + ... + 1640865.

It is an arithmetic number, because the mean of its divisors is an integer number (39202254).

Almost surely, 2^1723997340 is an apocalyptic number.

1723997340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1723997340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2822562288).

1723997340 is an abundant number, since it is smaller than the sum of its proper divisors (3921127236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1723997340 is a wasteful number, since it uses less digits than its factorization.

1723997340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 1723997340 is about 41521.0469521182. The cubic root of 1723997340 is about 1199.0727420117.

The spelling of 1723997340 in words is "one billion, seven hundred twenty-three million, nine hundred ninety-seven thousand, three hundred forty".