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261390 = 2358713
BaseRepresentation
bin111111110100001110
3111021120010
4333310032
531331030
65334050
72136033
oct776416
9437503
10261390
11169428
12107326
1391c8c
146b38a
15526b0
hex3fd0e

261390 has 16 divisors (see below), whose sum is σ = 627408. Its totient is φ = 69696.

The previous prime is 261389. The next prime is 261407. The reversal of 261390 is 93162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4327 + ... + 4386.

It is an arithmetic number, because the mean of its divisors is an integer number (39213).

2261390 is an apocalyptic number.

261390 is an abundant number, since it is smaller than the sum of its proper divisors (366018).

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

261390 is a wasteful number, since it uses less digits than its factorization.

261390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8723.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 261390 is about 511.2631416404. The cubic root of 261390 is about 63.9385803985.

The spelling of 261390 in words is "two hundred sixty-one thousand, three hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 8713 17426 26139 43565 52278 87130 130695 261390