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43990 = 255383
BaseRepresentation
bin1010101111010110
32020100021
422233112
52401430
6535354
7242152
oct125726
966307
1043990
1130061
122155a
131703b
1412062
15d07a
hexabd6

43990 has 16 divisors (see below), whose sum is σ = 81648. Its totient is φ = 17056.

The previous prime is 43987. The next prime is 43991. The reversal of 43990 is 9934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43991) 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, 489 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (5103).

243990 is an apocalyptic number.

43990 is a deficient number, since it is larger than the sum of its proper divisors (37658).

43990 is a wasteful number, since it uses less digits than its factorization.

43990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 43990 is about 209.7379317148. The cubic root of 43990 is about 35.3008086443.

It can be divided in two parts, 439 and 90, that added together give a square (529 = 232).

The spelling of 43990 in words is "forty-three thousand, nine hundred ninety".

Divisors: 1 2 5 10 53 83 106 166 265 415 530 830 4399 8798 21995 43990