1500000 has 84 divisors (see below), whose sum is σ = 4921812. Its totient is φ = 400000.

The previous prime is 1499977. The next prime is 1500007. The reversal of 1500000 is 51.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1500007) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 299998 + ... + 300002.

It is an arithmetic number, because the mean of its divisors is an integer number (58593).

2^1500000 is an apocalyptic number.

1500000 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 1500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2460906).

1500000 is an abundant number, since it is smaller than the sum of its proper divisors (3421812).

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

1500000 is an frugal number, since it uses more digits than its factorization.

1500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 6.

The square root of 1500000 is about 1224.7448713916. The cubic root of 1500000 is about 114.4714242553.

Adding to 1500000 its reverse (51), we get a palindrome (1500051).

The spelling of 1500000 in words is "one million, five hundred thousand".