1520001 has 24 divisors (see below), whose sum is σ = 2620800. Its totient is φ = 830016.

The previous prime is 1519967. The next prime is 1520003. The reversal of 1520001 is 1000251.

It is a happy number.

It is not a de Polignac number, because 1520001 - 2¹⁰ = 1518977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520003) 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, 925 + ... + 1973.

It is an arithmetic number, because the mean of its divisors is an integer number (109200).

2^1520001 is an apocalyptic number.

It is an amenable number.

1520001 is a deficient number, since it is larger than the sum of its proper divisors (1100799).

1520001 is a wasteful number, since it uses less digits than its factorization.

1520001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1520001 is about 1232.8832061473. The cubic root of 1520001 is about 114.9779667934.

Adding to 1520001 its reverse (1000251), we get a palindrome (2520252).

The spelling of 1520001 in words is "one million, five hundred twenty thousand, one".