340622721 has 6 divisors (see below), whose sum is σ = 492010610. Its totient is φ = 227081808.

The previous prime is 340622717. The next prime is 340622729. The reversal of 340622721 is 127226043.

340622721 is a `hidden beast` number, since 34 + 0 + 622 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 333573696 + 7049025 = 18264^2 + 2655^2 .

It is not a de Polignac number, because 340622721 - 2² = 340622717 is a prime.

It is a super-2 number, since 2×340622721² = 232047676122887682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340622729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18923476 + ... + 18923493.

Almost surely, 2^340622721 is an apocalyptic number.

It is an amenable number.

340622721 is a deficient number, since it is larger than the sum of its proper divisors (151387889).

340622721 is a wasteful number, since it uses less digits than its factorization.

340622721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37846975 (or 37846972 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 340622721 is about 18455.9670838458. The cubic root of 340622721 is about 698.3790527702.

Adding to 340622721 its reverse (127226043), we get a palindrome (467848764).

The spelling of 340622721 in words is "three hundred forty million, six hundred twenty-two thousand, seven hundred twenty-one".