340291621 has 4 divisors (see below), whose sum is σ = 340372044. Its totient is φ = 340211200.

The previous prime is 340291603. The next prime is 340291639. The reversal of 340291621 is 126192043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126192043 = 307 ⋅411049.

It is an interprime number because it is at equal distance from previous prime (340291603) and next prime (340291639).

It can be written as a sum of positive squares in 2 ways, for example, as 282744225 + 57547396 = 16815^2 + 7586^2 .

It is a cyclic number.

It is not a de Polignac number, because 340291621 - 2¹³ = 340283429 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 340291621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340291921) 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, 33490 + ... + 42451.

It is an arithmetic number, because the mean of its divisors is an integer number (85093011).

Almost surely, 2^340291621 is an apocalyptic number.

It is an amenable number.

340291621 is a deficient number, since it is larger than the sum of its proper divisors (80423).

340291621 is an equidigital number, since it uses as much as digits as its factorization.

340291621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80422.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 340291621 is about 18446.9949043198. The cubic root of 340291621 is about 698.1526945410.

The spelling of 340291621 in words is "three hundred forty million, two hundred ninety-one thousand, six hundred twenty-one".