340427721 has 16 divisors (see below), whose sum is σ = 464258304. Its totient is φ = 221789184.

The previous prime is 340427707. The next prime is 340427743. The reversal of 340427721 is 127724043.

It is not a de Polignac number, because 340427721 - 2¹³ = 340419529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (340427221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122281 + ... + 125033.

It is an arithmetic number, because the mean of its divisors is an integer number (29016144).

Almost surely, 2^340427721 is an apocalyptic number.

It is an amenable number.

340427721 is a deficient number, since it is larger than the sum of its proper divisors (123830583).

340427721 is a wasteful number, since it uses less digits than its factorization.

340427721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680.

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 340427721 is about 18450.6834832751. The cubic root of 340427721 is about 698.2457577757.

It can be divided in two parts, 3404 and 27721, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 340427721 in words is "three hundred forty million, four hundred twenty-seven thousand, seven hundred twenty-one".