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18990546 = 2337131653
BaseRepresentation
bin100100001110…
…0010111010010
31022201211010120
41020130113102
514330144141
61515011110
7320263011
oct110342722
938654116
1018990546
11a7a0973
126439a96
133c1bb13
142744a78
151a01c66
hex121c5d2

18990546 has 32 divisors (see below), whose sum is σ = 39365568. Its totient is φ = 6102720.

The previous prime is 18990541. The next prime is 18990599. The reversal of 18990546 is 64509981.

It is a junction number, because it is equal to n+sod(n) for n = 18990498 and 18990507.

It is not an unprimeable number, because it can be changed into a prime (18990541) 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 15 ways as a sum of consecutive naturals, for example, 28756 + ... + 29408.

It is an arithmetic number, because the mean of its divisors is an integer number (1230174).

Almost surely, 218990546 is an apocalyptic number.

18990546 is an abundant number, since it is smaller than the sum of its proper divisors (20375022).

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

18990546 is a wasteful number, since it uses less digits than its factorization.

18990546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 18990546 is about 4357.8143604335. The cubic root of 18990546 is about 266.7958995134.

The spelling of 18990546 in words is "eighteen million, nine hundred ninety thousand, five hundred forty-six".

Divisors: 1 2 3 6 37 74 111 131 222 262 393 653 786 1306 1959 3918 4847 9694 14541 24161 29082 48322 72483 85543 144966 171086 256629 513258 3165091 6330182 9495273 18990546