1040320040 has 64 divisors (see below), whose sum is σ = 2391878160. Its totient is φ = 407080960.

The previous prime is 1040320031. The next prime is 1040320079. The reversal of 1040320040 is 400230401.

It can be written as a sum of positive squares in 8 ways, for example, as 165225316 + 875094724 = 12854^2 + 29582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1040319997 and 1040320024.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1180400 + ... + 1181280.

Almost surely, 2^1040320040 is an apocalyptic number.

1040320040 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 1040320040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1195939080).

1040320040 is an abundant number, since it is smaller than the sum of its proper divisors (1351558120).

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

1040320040 is a wasteful number, since it uses less digits than its factorization.

1040320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1498 counting only the distinct ones).

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

The square root of 1040320040 is about 32253.9926210694. The cubic root of 1040320040 is about 1013.2633199357.

Adding to 1040320040 its reverse (400230401), we get a palindrome (1440550441).

The spelling of 1040320040 in words is "one billion, forty million, three hundred twenty thousand, forty".