340021253 has 32 divisors (see below), whose sum is σ = 413035392. Its totient is φ = 278087040.

The previous prime is 340021243. The next prime is 340021271. The reversal of 340021253 is 352120043.

It is a happy number.

It is not a de Polignac number, because 340021253 - 2¹⁸ = 339759109 is a prime.

It is a super-2 number, since 2×340021253² = 231228904983380018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340021243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 743801 + ... + 744257.

It is an arithmetic number, because the mean of its divisors is an integer number (12907356).

Almost surely, 2^340021253 is an apocalyptic number.

It is an amenable number.

340021253 is a deficient number, since it is larger than the sum of its proper divisors (73014139).

340021253 is a wasteful number, since it uses less digits than its factorization.

340021253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 340021253 is about 18439.6652084576. The cubic root of 340021253 is about 697.9677471325.

Adding to 340021253 its reverse (352120043), we get a palindrome (692141296).

The spelling of 340021253 in words is "three hundred forty million, twenty-one thousand, two hundred fifty-three".