1040399280 has 60 divisors (see below), whose sum is σ = 3494010000. Its totient is φ = 277439616.

The previous prime is 1040399251. The next prime is 1040399287. The reversal of 1040399280 is 829930401.

1040399280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1040399287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 721780 + ... + 723219.

It is an arithmetic number, because the mean of its divisors is an integer number (58233500).

Almost surely, 2^1040399280 is an apocalyptic number.

1040399280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1040399280 is an abundant number, since it is smaller than the sum of its proper divisors (2453610720).

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

1040399280 is a wasteful number, since it uses less digits than its factorization.

1040399280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445018 (or 1445009 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1040399280 is about 32255.2209727356. The cubic root of 1040399280 is about 1013.2890456560.

The spelling of 1040399280 in words is "one billion, forty million, three hundred ninety-nine thousand, two hundred eighty".