1042400340 has 60 divisors (see below), whose sum is σ = 3270053556. Its totient is φ = 277972992.

The previous prime is 1042400329. The next prime is 1042400341. The reversal of 1042400340 is 430042401.

It can be written as a sum of positive squares in 2 ways, for example, as 430728516 + 611671824 = 20754^2 + 24732^2 .

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 (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042400341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 320109 + ... + 323348.

Almost surely, 2^1042400340 is an apocalyptic number.

1042400340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1042400340 is an abundant number, since it is smaller than the sum of its proper divisors (2227653216).

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

1042400340 is a wasteful number, since it uses less digits than its factorization.

1042400340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643478 (or 643467 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1042400340 is about 32286.2252361592. The cubic root of 1042400340 is about 1013.9382687114.

Adding to 1042400340 its reverse (430042401), we get a palindrome (1472442741).

The spelling of 1042400340 in words is "one billion, forty-two million, four hundred thousand, three hundred forty".