340512820 has 12 divisors (see below), whose sum is σ = 715076964. Its totient is φ = 136205120.

The previous prime is 340512817. The next prime is 340512847. The reversal of 340512820 is 28215043.

It can be written as a sum of positive squares in 2 ways, for example, as 251285904 + 89226916 = 15852^2 + 9446^2 .

340512820 is a modest number, since divided by 512820 gives 340 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8512801 + ... + 8512840.

It is an arithmetic number, because the mean of its divisors is an integer number (59589747).

Almost surely, 2^340512820 is an apocalyptic number.

It is an amenable number.

340512820 is an abundant number, since it is smaller than the sum of its proper divisors (374564144).

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

340512820 is a wasteful number, since it uses less digits than its factorization.

340512820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17025650 (or 17025648 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 340512820 is about 18452.9894597054. The cubic root of 340512820 is about 698.3039346530.

Adding to 340512820 its reverse (28215043), we get a palindrome (368727863).

The spelling of 340512820 in words is "three hundred forty million, five hundred twelve thousand, eight hundred twenty".