253840357 has 4 divisors (see below), whose sum is σ = 253946956. Its totient is φ = 253733760.

The previous prime is 253840333. The next prime is 253840381. The reversal of 253840357 is 753048352.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (253840333) and next prime (253840381).

It can be written as a sum of positive squares in 2 ways, for example, as 195608196 + 58232161 = 13986^2 + 7631^2 .

It is a cyclic number.

It is not a de Polignac number, because 253840357 - 2¹⁹ = 253316069 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 (253846357) 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, 49644 + ... + 54517.

It is an arithmetic number, because the mean of its divisors is an integer number (63486739).

Almost surely, 2^253840357 is an apocalyptic number.

It is an amenable number.

253840357 is a deficient number, since it is larger than the sum of its proper divisors (106599).

253840357 is a wasteful number, since it uses less digits than its factorization.

253840357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106598.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 253840357 is about 15932.3682169350. The cubic root of 253840357 is about 633.1698451201.

The spelling of 253840357 in words is "two hundred fifty-three million, eight hundred forty thousand, three hundred fifty-seven".