340785521 has 4 divisors (see below), whose sum is σ = 341797092. Its totient is φ = 339773952.

The previous prime is 340785493. The next prime is 340785527. The reversal of 340785521 is 125587043.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190992400 + 149793121 = 13820^2 + 12239^2 .

It is a cyclic number.

It is not a de Polignac number, because 340785521 - 2¹⁴ = 340769137 is a prime.

It is a super-2 number, since 2×340785521² = 232269542646482882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340785527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505280 + ... + 505953.

It is an arithmetic number, because the mean of its divisors is an integer number (85449273).

Almost surely, 2^340785521 is an apocalyptic number.

It is an amenable number.

340785521 is a deficient number, since it is larger than the sum of its proper divisors (1011571).

340785521 is a wasteful number, since it uses less digits than its factorization.

340785521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011570.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 340785521 is about 18460.3770546541. The cubic root of 340785521 is about 698.4902980414.

The spelling of 340785521 in words is "three hundred forty million, seven hundred eighty-five thousand, five hundred twenty-one".