340651621 has 4 divisors (see below), whose sum is σ = 342907744. Its totient is φ = 338395500.

The previous prime is 340651573. The next prime is 340651639. The reversal of 340651621 is 126156043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126156043 = 13 ⋅9704311.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340651621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340651621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340657621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127835 + ... + 1128136.

It is an arithmetic number, because the mean of its divisors is an integer number (85726936).

Almost surely, 2^340651621 is an apocalyptic number.

It is an amenable number.

340651621 is a deficient number, since it is larger than the sum of its proper divisors (2256123).

340651621 is a wasteful number, since it uses less digits than its factorization.

340651621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256122.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 340651621 is about 18456.7500118520. The cubic root of 340651621 is about 698.3988034431.

The spelling of 340651621 in words is "three hundred forty million, six hundred fifty-one thousand, six hundred twenty-one".