340404213656 has 16 divisors (see below), whose sum is σ = 687354662400. Its totient is φ = 157109637024.

The previous prime is 340404213631. The next prime is 340404213661. The reversal of 340404213656 is 656312404043.

It is a super-3 number, since 3×340404213656³ (a number of 36 digits) contains 333 as substring.

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, 1636558616 + ... + 1636558823.

It is an arithmetic number, because the mean of its divisors is an integer number (42959666400).

Almost surely, 2^340404213656 is an apocalyptic number.

It is an amenable number.

340404213656 is an abundant number, since it is smaller than the sum of its proper divisors (346950448744).

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

340404213656 is a wasteful number, since it uses less digits than its factorization.

340404213656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3273117458 (or 3273117454 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 340404213656 its reverse (656312404043), we get a palindrome (996716617699).

The spelling of 340404213656 in words is "three hundred forty billion, four hundred four million, two hundred thirteen thousand, six hundred fifty-six".