340537621 has 4 divisors (see below), whose sum is σ = 341387244. Its totient is φ = 339688000.

The previous prime is 340537619. The next prime is 340537651. The reversal of 340537621 is 126735043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126735043 = 179 ⋅708017.

It can be written as a sum of positive squares in 2 ways, for example, as 308388721 + 32148900 = 17561^2 + 5670^2 .

It is a cyclic number.

It is not a de Polignac number, because 340537621 - 2¹ = 340537619 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340537651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424210 + ... + 425011.

It is an arithmetic number, because the mean of its divisors is an integer number (85346811).

Almost surely, 2^340537621 is an apocalyptic number.

It is an amenable number.

340537621 is a deficient number, since it is larger than the sum of its proper divisors (849623).

340537621 is an equidigital number, since it uses as much as digits as its factorization.

340537621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849622.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 340537621 is about 18453.6614524056. The cubic root of 340537621 is about 698.3208877253.

The spelling of 340537621 in words is "three hundred forty million, five hundred thirty-seven thousand, six hundred twenty-one".