340400645 has 24 divisors (see below), whose sum is σ = 446987016. Its totient is φ = 248721408.

The previous prime is 340400633. The next prime is 340400647. The reversal of 340400645 is 546004043.

It can be written as a sum of positive squares in 12 ways, for example, as 299670721 + 40729924 = 17311^2 + 6382^2 .

It is not a de Polignac number, because 340400645 - 2¹⁰ = 340399621 is a prime.

It is a super-3 number, since 3×340400645³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340400647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79889 + ... + 84041.

It is an arithmetic number, because the mean of its divisors is an integer number (18624459).

Almost surely, 2^340400645 is an apocalyptic number.

It is an amenable number.

340400645 is a deficient number, since it is larger than the sum of its proper divisors (106586371).

340400645 is a wasteful number, since it uses less digits than its factorization.

340400645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4281 (or 4268 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 340400645 is about 18449.9497289288. The cubic root of 340400645 is about 698.2272455706.

Adding to 340400645 its reverse (546004043), we get a palindrome (886404688).

The spelling of 340400645 in words is "three hundred forty million, four hundred thousand, six hundred forty-five".