340421557 has 8 divisors (see below), whose sum is σ = 394383296. Its totient is φ = 287792352.

The previous prime is 340421531. The next prime is 340421567. The reversal of 340421557 is 755124043.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340421557 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 (340421527) 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, 332583 + ... + 333604.

It is an arithmetic number, because the mean of its divisors is an integer number (49297912).

Almost surely, 2^340421557 is an apocalyptic number.

It is an amenable number.

340421557 is a deficient number, since it is larger than the sum of its proper divisors (53961739).

340421557 is an equidigital number, since it uses as much as digits as its factorization.

340421557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666267.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 340421557 is about 18450.5164426365. The cubic root of 340421557 is about 698.2415434569.

The spelling of 340421557 in words is "three hundred forty million, four hundred twenty-one thousand, five hundred fifty-seven".