1023440 has 40 divisors (see below), whose sum is σ = 2598048. Its totient is φ = 371840.

The previous prime is 1023419. The next prime is 1023461. The reversal of 1023440 is 443201.

It is an interprime number because it is at equal distance from previous prime (1023419) and next prime (1023461).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 299 + ... + 1461.

2^1023440 is an apocalyptic number.

1023440 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 1023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299024).

1023440 is an abundant number, since it is smaller than the sum of its proper divisors (1574608).

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

1023440 is a wasteful number, since it uses less digits than its factorization.

1023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1023440 is about 1011.6521141183. The cubic root of 1023440 is about 100.7753067925.

Adding to 1023440 its reverse (443201), we get a palindrome (1466641).

The spelling of 1023440 in words is "one million, twenty-three thousand, four hundred forty".