1023540 has 48 divisors (see below), whose sum is σ = 3276672. Its totient is φ = 233856.

The previous prime is 1023521. The next prime is 1023541. The reversal of 1023540 is 453201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023541) 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, 799 + ... + 1638.

It is an arithmetic number, because the mean of its divisors is an integer number (68264).

2^1023540 is an apocalyptic number.

1023540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023540 is an abundant number, since it is smaller than the sum of its proper divisors (2253132).

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

1023540 is a wasteful number, since it uses less digits than its factorization.

1023540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456 (or 2454 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1023540 is about 1011.7015370157. The cubic root of 1023540 is about 100.7785889268.

Adding to 1023540 its reverse (453201), we get a palindrome (1476741).

The spelling of 1023540 in words is "one million, twenty-three thousand, five hundred forty".