1523720 has 32 divisors (see below), whose sum is σ = 3741120. Its totient is φ = 553920.

The previous prime is 1523707. The next prime is 1523737. The reversal of 1523720 is 273251.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1523692 and 1523701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292 + ... + 2171.

It is an arithmetic number, because the mean of its divisors is an integer number (116910).

2^1523720 is an apocalyptic number.

1523720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1523720 is an abundant number, since it is smaller than the sum of its proper divisors (2217400).

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

1523720 is a wasteful number, since it uses less digits than its factorization.

1523720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485 (or 3481 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 1523720 is about 1234.3905378769. The cubic root of 1523720 is about 115.0716629580.

Adding to 1523720 its reverse (273251), we get a palindrome (1796971).

The spelling of 1523720 in words is "one million, five hundred twenty-three thousand, seven hundred twenty".