340209421 has 8 divisors (see below), whose sum is σ = 366444320. Its totient is φ = 314807472.

The previous prime is 340209377. The next prime is 340209479. The reversal of 340209421 is 124902043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 340209421 - 2⁹ = 340208909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340209521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207390 + ... + 209023.

It is an arithmetic number, because the mean of its divisors is an integer number (45805540).

Almost surely, 2^340209421 is an apocalyptic number.

It is an amenable number.

340209421 is a deficient number, since it is larger than the sum of its proper divisors (26234899).

340209421 is a wasteful number, since it uses less digits than its factorization.

340209421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416475.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 340209421 is about 18444.7667645866. The cubic root of 340209421 is about 698.0964753363.

The spelling of 340209421 in words is "three hundred forty million, two hundred nine thousand, four hundred twenty-one".