999740 has 48 divisors (see below), whose sum is σ = 2476992. Its totient is φ = 331776.

The previous prime is 999727. The next prime is 999749. The reversal of 999740 is 47999.

999740 = 350² + 351² + ... + 357².

999740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999694 and 999703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5084 + ... + 5276.

It is an arithmetic number, because the mean of its divisors is an integer number (51604).

2⁹⁹⁹⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238496).

999740 is an abundant number, since it is smaller than the sum of its proper divisors (1477252).

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

999740 is a wasteful number, since it uses less digits than its factorization.

999740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 999740 is about 999.8699915489. The cubic root of 999740 is about 99.9913325821.

The spelling of 999740 in words is "nine hundred ninety-nine thousand, seven hundred forty".