1520023 has 4 divisors (see below), whose sum is σ = 1569088. Its totient is φ = 1470960.

The previous prime is 1520011. The next prime is 1520069. The reversal of 1520023 is 3200251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1519985 and 1520012.

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 3 ways as a sum of consecutive naturals, for example, 24486 + ... + 24547.

It is an arithmetic number, because the mean of its divisors is an integer number (392272).

2^1520023 is an apocalyptic number.

1520023 is a deficient number, since it is larger than the sum of its proper divisors (49065).

1520023 is an equidigital number, since it uses as much as digits as its factorization.

1520023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49064.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 1520023 is about 1232.8921282902. The cubic root of 1520023 is about 114.9785215086.

Adding to 1520023 its reverse (3200251), we get a palindrome (4720274).

The spelling of 1520023 in words is "one million, five hundred twenty thousand, twenty-three".