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257442 = 23107401
BaseRepresentation
bin111110110110100010
3111002010220
4332312202
531214232
65303510
72121363
oct766642
9432126
10257442
11166469
12104b96
1390243
1469b6a
155142c
hex3eda2

257442 has 16 divisors (see below), whose sum is σ = 520992. Its totient is φ = 84800.

The previous prime is 257437. The next prime is 257443. The reversal of 257442 is 244752.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (257443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442 + ... + 842.

It is an arithmetic number, because the mean of its divisors is an integer number (32562).

2257442 is an apocalyptic number.

257442 is an abundant number, since it is smaller than the sum of its proper divisors (263550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257442 is a wasteful number, since it uses less digits than its factorization.

257442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its digits is 2240, while the sum is 24.

The square root of 257442 is about 507.3874259380. The cubic root of 257442 is about 63.6150393610.

The spelling of 257442 in words is "two hundred fifty-seven thousand, four hundred forty-two".

Divisors: 1 2 3 6 107 214 321 401 642 802 1203 2406 42907 85814 128721 257442