1724297940 has 72 divisors (see below), whose sum is σ = 5237592360. Its totient is φ = 459177984.

The previous prime is 1724297929. The next prime is 1724297941. The reversal of 1724297940 is 497924271.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 316697616 + 1407600324 = 17796^2 + 37518^2 .

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 (1724297941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132192 + ... + 144648.

Almost surely, 2^1724297940 is an apocalyptic number.

1724297940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1724297940 is an abundant number, since it is smaller than the sum of its proper divisors (3513294420).

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

1724297940 is a wasteful number, since it uses less digits than its factorization.

1724297940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13241 (or 13236 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1724297940 is about 41524.6666452604. Note that the first 4 decimals coincide. The cubic root of 1724297940 is about 1199.1424289559.

The spelling of 1724297940 in words is "one billion, seven hundred twenty-four million, two hundred ninety-seven thousand, nine hundred forty".