1040123240 has 128 divisors (see below), whose sum is σ = 2698284960. Its totient is φ = 357433344.

The previous prime is 1040123221. The next prime is 1040123263. The reversal of 1040123240 is 423210401.

It can be written as a sum of positive squares in 16 ways, for example, as 1865956 + 1038257284 = 1366^2 + 32222^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 856874 + ... + 858086.

Almost surely, 2^1040123240 is an apocalyptic number.

1040123240 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 1040123240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349142480).

1040123240 is an abundant number, since it is smaller than the sum of its proper divisors (1658161720).

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

1040123240 is a wasteful number, since it uses less digits than its factorization.

1040123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1347 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1040123240 is about 32250.9416916778. The cubic root of 1040123240 is about 1013.1994220360.

Adding to 1040123240 its reverse (423210401), we get a palindrome (1463333641).

The spelling of 1040123240 in words is "one billion, forty million, one hundred twenty-three thousand, two hundred forty".